diff --git a/.changeset/funny-houses-rest.md b/.changeset/funny-houses-rest.md
new file mode 100644
index 0000000000..21efce8c19
--- /dev/null
+++ b/.changeset/funny-houses-rest.md
@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-techdocs-backend': patch
+---
+
+The `createRouter` and its related types has been marked as deprecared. This backend should instead be initialized using the new backend system.
diff --git a/plugins/techdocs-backend/api-report.md b/plugins/techdocs-backend/api-report.md
index ec3c2ada82..a73647c40a 100644
--- a/plugins/techdocs-backend/api-report.md
+++ b/plugins/techdocs-backend/api-report.md
@@ -8,6 +8,7 @@ import { CatalogApi } from '@backstage/catalog-client';
 import { CatalogClient } from '@backstage/catalog-client';
 import { Config } from '@backstage/config';
 import { DefaultTechDocsCollatorFactory as DefaultTechDocsCollatorFactory_2 } from '@backstage/plugin-search-backend-module-techdocs';
+import { DiscoveryService } from '@backstage/backend-plugin-api';
 import { DocsBuildStrategy as DocsBuildStrategy_2 } from '@backstage/plugin-techdocs-node';
 import { Entity } from '@backstage/catalog-model';
 import express from 'express';
@@ -17,7 +18,6 @@ import { Knex } from 'knex';
 import { Logger } from 'winston';
 import { Permission } from '@backstage/plugin-permission-common';
 import { PluginCacheManager } from '@backstage/backend-common';
-import { PluginEndpointDiscovery } from '@backstage/backend-common';
 import { PreparerBuilder } from '@backstage/plugin-techdocs-node';
 import { PublisherBase } from '@backstage/plugin-techdocs-node';
 import type { TechDocsCollatorFactoryOptions as TechDocsCollatorFactoryOptions_2 } from '@backstage/plugin-search-backend-module-techdocs';
@@ -25,7 +25,7 @@ import { TechDocsDocument as TechDocsDocument_2 } from '@backstage/plugin-techdo
 import { TokenManager } from '@backstage/backend-common';
 import * as winston from 'winston';
 
-// @public
+// @public @deprecated
 export function createRouter(options: RouterOptions): Promise<express.Router>;
 
 // @public @deprecated
@@ -60,7 +60,7 @@ export type OutOfTheBoxDeploymentOptions = {
   generators: GeneratorBuilder;
   publisher: PublisherBase;
   logger: winston.Logger;
-  discovery: PluginEndpointDiscovery;
+  discovery: DiscoveryService;
   database?: Knex;
   config: Config;
   cache: PluginCacheManager;
@@ -71,11 +71,11 @@ export type OutOfTheBoxDeploymentOptions = {
   auth?: AuthService;
 };
 
-// @public
+// @public @deprecated
 export type RecommendedDeploymentOptions = {
   publisher: PublisherBase;
   logger: winston.Logger;
-  discovery: PluginEndpointDiscovery;
+  discovery: DiscoveryService;
   config: Config;
   cache: PluginCacheManager;
   docsBuildStrategy?: DocsBuildStrategy_2;
@@ -85,7 +85,7 @@ export type RecommendedDeploymentOptions = {
   auth?: AuthService;
 };
 
-// @public
+// @public @deprecated
 export type RouterOptions =
   | RecommendedDeploymentOptions
   | OutOfTheBoxDeploymentOptions;
@@ -100,7 +100,7 @@ export type TechDocsCollatorFactoryOptions = TechDocsCollatorFactoryOptions_2;
 
 // @public
 export type TechDocsCollatorOptions = {
-  discovery: PluginEndpointDiscovery;
+  discovery: DiscoveryService;
   logger: Logger;
   tokenManager: TokenManager;
   locationTemplate?: string;
diff --git a/plugins/techdocs-backend/src/cache/TechDocsCache.test.ts b/plugins/techdocs-backend/src/cache/TechDocsCache.test.ts
index 7dff7069db..1cdd0174b5 100644
--- a/plugins/techdocs-backend/src/cache/TechDocsCache.test.ts
+++ b/plugins/techdocs-backend/src/cache/TechDocsCache.test.ts
@@ -14,10 +14,10 @@
  * limitations under the License.
  */
 
-import { CacheClient, loggerToWinstonLogger } from '@backstage/backend-common';
 import { ConfigReader } from '@backstage/config';
 import { CacheInvalidationError, TechDocsCache } from './TechDocsCache';
 import { mockServices } from '@backstage/backend-test-utils';
+import { CacheService } from '@backstage/backend-plugin-api';
 
 const cached = (str: string): string => {
   return Buffer.from(str).toString('base64');
@@ -25,7 +25,7 @@ const cached = (str: string): string => {
 
 describe('TechDocsCache', () => {
   let CacheUnderTest: TechDocsCache;
-  let MockClient: jest.Mocked<CacheClient>;
+  let MockClient: jest.Mocked<CacheService>;
 
   beforeEach(() => {
     MockClient = {
@@ -36,7 +36,7 @@ describe('TechDocsCache', () => {
     };
     CacheUnderTest = TechDocsCache.fromConfig(new ConfigReader({}), {
       cache: MockClient,
-      logger: loggerToWinstonLogger(mockServices.logger.mock()),
+      logger: mockServices.logger.mock(),
     });
   });
 
@@ -83,7 +83,7 @@ describe('TechDocsCache', () => {
         }),
         {
           cache: MockClient,
-          logger: loggerToWinstonLogger(mockServices.logger.mock()),
+          logger: mockServices.logger.mock(),
         },
       );
 
diff --git a/plugins/techdocs-backend/src/cache/TechDocsCache.ts b/plugins/techdocs-backend/src/cache/TechDocsCache.ts
index 807d6ca87b..a5eb4d37be 100644
--- a/plugins/techdocs-backend/src/cache/TechDocsCache.ts
+++ b/plugins/techdocs-backend/src/cache/TechDocsCache.ts
@@ -13,16 +13,15 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import { CacheClient } from '@backstage/backend-common';
 import { assertError, CustomErrorBase } from '@backstage/errors';
 import { Config } from '@backstage/config';
-import { Logger } from 'winston';
+import { CacheService, LoggerService } from '@backstage/backend-plugin-api';
 
 export class CacheInvalidationError extends CustomErrorBase {}
 
 export class TechDocsCache {
-  protected readonly cache: CacheClient;
-  protected readonly logger: Logger;
+  protected readonly cache: CacheService;
+  protected readonly logger: LoggerService;
   protected readonly readTimeout: number;
 
   private constructor({
@@ -30,8 +29,8 @@ export class TechDocsCache {
     logger,
     readTimeout,
   }: {
-    cache: CacheClient;
-    logger: Logger;
+    cache: CacheService;
+    logger: LoggerService;
     readTimeout: number;
   }) {
     this.cache = cache;
@@ -41,7 +40,7 @@ export class TechDocsCache {
 
   static fromConfig(
     config: Config,
-    { cache, logger }: { cache: CacheClient; logger: Logger },
+    { cache, logger }: { cache: CacheService; logger: LoggerService },
   ) {
     const timeout = config.getOptionalNumber('techdocs.cache.readTimeout');
     const readTimeout = timeout === undefined ? 1000 : timeout;
@@ -67,7 +66,7 @@ export class TechDocsCache {
     } catch (e) {
       assertError(e);
       this.logger.warn(`Error getting cache entry ${path}: ${e.message}`);
-      this.logger.debug(e.stack);
+      this.logger.debug(e.message, e);
       return undefined;
     }
   }
diff --git a/plugins/techdocs-backend/src/cache/cacheMiddleware.test.ts b/plugins/techdocs-backend/src/cache/cacheMiddleware.test.ts
index 1d814c3caa..d64c08e072 100644
--- a/plugins/techdocs-backend/src/cache/cacheMiddleware.test.ts
+++ b/plugins/techdocs-backend/src/cache/cacheMiddleware.test.ts
@@ -14,7 +14,6 @@
  * limitations under the License.
  */
 
-import { loggerToWinstonLogger } from '@backstage/backend-common';
 import express from 'express';
 import request from 'supertest';
 import { createCacheMiddleware } from './cacheMiddleware';
@@ -58,7 +57,7 @@ describe('createCacheMiddleware', () => {
       invalidateMultiple: jest.fn().mockResolvedValue(undefined),
     } as unknown as jest.Mocked<TechDocsCache>;
     const router = await createCacheMiddleware({
-      logger: loggerToWinstonLogger(mockServices.logger.mock()),
+      logger: mockServices.logger.mock(),
       cache,
     });
     app = express().use(router);
diff --git a/plugins/techdocs-backend/src/cache/cacheMiddleware.ts b/plugins/techdocs-backend/src/cache/cacheMiddleware.ts
index 51cce6d220..02b35cf7bf 100644
--- a/plugins/techdocs-backend/src/cache/cacheMiddleware.ts
+++ b/plugins/techdocs-backend/src/cache/cacheMiddleware.ts
@@ -15,12 +15,12 @@
  */
 import { Router } from 'express';
 import router from 'express-promise-router';
-import { Logger } from 'winston';
 import { TechDocsCache } from './TechDocsCache';
+import { LoggerService } from '@backstage/backend-plugin-api';
 
 type CacheMiddlewareOptions = {
   cache: TechDocsCache;
-  logger: Logger;
+  logger: LoggerService;
 };
 
 type ErrorCallback = (err?: Error) => void;
diff --git a/plugins/techdocs-backend/src/search/DefaultTechDocsCollator.test.ts b/plugins/techdocs-backend/src/search/DefaultTechDocsCollator.test.ts
index 96f8cfd696..e010856792 100644
--- a/plugins/techdocs-backend/src/search/DefaultTechDocsCollator.test.ts
+++ b/plugins/techdocs-backend/src/search/DefaultTechDocsCollator.test.ts
@@ -14,11 +14,7 @@
  * limitations under the License.
  */
 
-import {
-  PluginEndpointDiscovery,
-  TokenManager,
-  loggerToWinstonLogger,
-} from '@backstage/backend-common';
+import { TokenManager, loggerToWinstonLogger } from '@backstage/backend-common';
 import { Entity } from '@backstage/catalog-model';
 import { DefaultTechDocsCollator } from './DefaultTechDocsCollator';
 import {
@@ -29,6 +25,7 @@ import { setupServer } from 'msw/node';
 import { rest } from 'msw';
 import { ConfigReader } from '@backstage/config';
 import { TECHDOCS_ANNOTATION } from '@backstage/plugin-techdocs-common';
+import { DiscoveryService } from '@backstage/backend-plugin-api';
 
 const logger = loggerToWinstonLogger(mockServices.logger.mock());
 
@@ -83,7 +80,7 @@ describe('TechDocs Collator', () => {
   registerMswTestHooks(worker);
 
   describe('DefaultTechDocsCollator with legacyPathCasing configuration', () => {
-    let mockDiscoveryApi: jest.Mocked<PluginEndpointDiscovery>;
+    let mockDiscoveryApi: jest.Mocked<DiscoveryService>;
     let mockTokenManager: jest.Mocked<TokenManager>;
     let collator: DefaultTechDocsCollator;
 
@@ -147,7 +144,7 @@ describe('TechDocs Collator', () => {
   });
 
   describe('DefaultTechDocsCollator', () => {
-    let mockDiscoveryApi: jest.Mocked<PluginEndpointDiscovery>;
+    let mockDiscoveryApi: jest.Mocked<DiscoveryService>;
     let mockTokenManager: jest.Mocked<TokenManager>;
     let collator: DefaultTechDocsCollator;
 
diff --git a/plugins/techdocs-backend/src/search/DefaultTechDocsCollator.ts b/plugins/techdocs-backend/src/search/DefaultTechDocsCollator.ts
index 527846df79..635833676c 100644
--- a/plugins/techdocs-backend/src/search/DefaultTechDocsCollator.ts
+++ b/plugins/techdocs-backend/src/search/DefaultTechDocsCollator.ts
@@ -14,10 +14,7 @@
  * limitations under the License.
  */
 
-import {
-  PluginEndpointDiscovery,
-  TokenManager,
-} from '@backstage/backend-common';
+import { TokenManager } from '@backstage/backend-common';
 import {
   Entity,
   parseEntityRef,
@@ -38,6 +35,7 @@ import {
 } from '@backstage/catalog-client';
 import { TechDocsDocument } from '@backstage/plugin-techdocs-node';
 import { TECHDOCS_ANNOTATION } from '@backstage/plugin-techdocs-common';
+import { DiscoveryService } from '@backstage/backend-plugin-api';
 
 interface MkSearchIndexDoc {
   title: string;
@@ -51,7 +49,7 @@ interface MkSearchIndexDoc {
  * @public
  */
 export type TechDocsCollatorOptions = {
-  discovery: PluginEndpointDiscovery;
+  discovery: DiscoveryService;
   logger: Logger;
   tokenManager: TokenManager;
   locationTemplate?: string;
diff --git a/plugins/techdocs-backend/src/service/CachedEntityLoader.test.ts b/plugins/techdocs-backend/src/service/CachedEntityLoader.test.ts
index 57e4dccbd4..492690611c 100644
--- a/plugins/techdocs-backend/src/service/CachedEntityLoader.test.ts
+++ b/plugins/techdocs-backend/src/service/CachedEntityLoader.test.ts
@@ -13,9 +13,9 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+import { CacheService } from '@backstage/backend-plugin-api';
 import { CachedEntityLoader } from './CachedEntityLoader';
 import { CatalogClient } from '@backstage/catalog-client';
-import { CacheClient } from '@backstage/backend-common';
 import { CompoundEntityRef } from '@backstage/catalog-model';
 
 describe('CachedEntityLoader', () => {
@@ -23,7 +23,7 @@ describe('CachedEntityLoader', () => {
     getEntityByRef: jest.fn(),
   } as any;
 
-  const cache: jest.Mocked<CacheClient> = {
+  const cache: jest.Mocked<CacheService> = {
     get: jest.fn(),
     set: jest.fn(),
   } as any;
diff --git a/plugins/techdocs-backend/src/service/CachedEntityLoader.ts b/plugins/techdocs-backend/src/service/CachedEntityLoader.ts
index 424d9b9541..d7d1fbbe2b 100644
--- a/plugins/techdocs-backend/src/service/CachedEntityLoader.ts
+++ b/plugins/techdocs-backend/src/service/CachedEntityLoader.ts
@@ -13,8 +13,8 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+import { CacheService } from '@backstage/backend-plugin-api';
 import { CatalogClient } from '@backstage/catalog-client';
-import { CacheClient } from '@backstage/backend-common';
 import {
   Entity,
   CompoundEntityRef,
@@ -23,12 +23,12 @@ import {
 
 export type CachedEntityLoaderOptions = {
   catalog: CatalogClient;
-  cache: CacheClient;
+  cache: CacheService;
 };
 
 export class CachedEntityLoader {
   private readonly catalog: CatalogClient;
-  private readonly cache: CacheClient;
+  private readonly cache: CacheService;
   private readonly readTimeout = 1000;
 
   constructor({ catalog, cache }: CachedEntityLoaderOptions) {
diff --git a/plugins/techdocs-backend/src/service/DocsSynchronizer.test.ts b/plugins/techdocs-backend/src/service/DocsSynchronizer.test.ts
index bb66c303b7..a611613716 100644
--- a/plugins/techdocs-backend/src/service/DocsSynchronizer.test.ts
+++ b/plugins/techdocs-backend/src/service/DocsSynchronizer.test.ts
@@ -14,10 +14,7 @@
  * limitations under the License.
  */
 
-import {
-  loggerToWinstonLogger,
-  PluginEndpointDiscovery,
-} from '@backstage/backend-common';
+import { loggerToWinstonLogger } from '@backstage/backend-common';
 import { ConfigReader } from '@backstage/config';
 import { ScmIntegrations } from '@backstage/integration';
 import {
@@ -31,6 +28,7 @@ import { TechDocsCache } from '../cache';
 import { DocsBuilder, shouldCheckForUpdate } from '../DocsBuilder';
 import { DocsSynchronizer, DocsSynchronizerSyncOpts } from './DocsSynchronizer';
 import { mockServices } from '@backstage/backend-test-utils';
+import { DiscoveryService } from '@backstage/backend-plugin-api';
 
 jest.mock('../DocsBuilder');
 jest.useFakeTimers();
@@ -66,7 +64,7 @@ describe('DocsSynchronizer', () => {
     hasDocsBeenGenerated: jest.fn(),
     publish: jest.fn(),
   };
-  const discovery: jest.Mocked<PluginEndpointDiscovery> = {
+  const discovery: jest.Mocked<DiscoveryService> = {
     getBaseUrl: jest.fn(),
     getExternalBaseUrl: jest.fn(),
   };
diff --git a/plugins/techdocs-backend/src/service/DocsSynchronizer.ts b/plugins/techdocs-backend/src/service/DocsSynchronizer.ts
index 7859b55e3f..e4b67e920e 100644
--- a/plugins/techdocs-backend/src/service/DocsSynchronizer.ts
+++ b/plugins/techdocs-backend/src/service/DocsSynchronizer.ts
@@ -14,7 +14,6 @@
  * limitations under the License.
  */
 
-import { PluginEndpointDiscovery } from '@backstage/backend-common';
 import {
   DEFAULT_NAMESPACE,
   Entity,
@@ -38,6 +37,7 @@ import {
   DocsBuilder,
   shouldCheckForUpdate,
 } from '../DocsBuilder';
+import { DiscoveryService } from '@backstage/backend-plugin-api';
 
 export type DocsSynchronizerSyncOpts = {
   log: (message: string) => void;
@@ -189,7 +189,7 @@ export class DocsSynchronizer {
     entity,
   }: {
     responseHandler: DocsSynchronizerSyncOpts;
-    discovery: PluginEndpointDiscovery;
+    discovery: DiscoveryService;
     token: string | undefined;
     entity: Entity;
   }) {
diff --git a/plugins/techdocs-backend/src/service/router.test.ts b/plugins/techdocs-backend/src/service/router.test.ts
index 72da3023b0..5b5fc52741 100644
--- a/plugins/techdocs-backend/src/service/router.test.ts
+++ b/plugins/techdocs-backend/src/service/router.test.ts
@@ -14,12 +14,7 @@
  * limitations under the License.
  */
 
-import {
-  errorHandler,
-  loggerToWinstonLogger,
-  PluginCacheManager,
-  PluginEndpointDiscovery,
-} from '@backstage/backend-common';
+import { loggerToWinstonLogger } from '@backstage/backend-common';
 import { ConfigReader } from '@backstage/config';
 import {
   DocsBuildStrategy,
@@ -33,7 +28,9 @@ import { DocsSynchronizer, DocsSynchronizerSyncOpts } from './DocsSynchronizer';
 import { CachedEntityLoader } from './CachedEntityLoader';
 import { createEventStream, createRouter, RouterOptions } from './router';
 import { TechDocsCache } from '../cache';
-import { mockServices } from '@backstage/backend-test-utils';
+import { mockErrorHandler, mockServices } from '@backstage/backend-test-utils';
+import { DiscoveryService } from '@backstage/backend-plugin-api';
+import { PluginCacheManager } from '@backstage/backend-defaults/cache';
 
 jest.mock('@backstage/catalog-client');
 jest.mock('@backstage/config');
@@ -76,7 +73,7 @@ const getMockHttpResponseFor = (content: string): Buffer => {
 const createApp = async (options: RouterOptions) => {
   const app = express();
   app.use(await createRouter(options));
-  app.use(errorHandler());
+  app.use(mockErrorHandler());
   return app;
 };
 
@@ -112,7 +109,7 @@ describe('createRouter', () => {
     hasDocsBeenGenerated: jest.fn(),
     publish: jest.fn(),
   };
-  const discovery: jest.Mocked<PluginEndpointDiscovery> = {
+  const discovery: jest.Mocked<DiscoveryService> = {
     getBaseUrl: jest.fn(),
     getExternalBaseUrl: jest.fn(),
   };
diff --git a/plugins/techdocs-backend/src/service/router.ts b/plugins/techdocs-backend/src/service/router.ts
index fff55a9ed1..0123ee89f2 100644
--- a/plugins/techdocs-backend/src/service/router.ts
+++ b/plugins/techdocs-backend/src/service/router.ts
@@ -14,9 +14,8 @@
  * limitations under the License.
  */
 import {
-  PluginEndpointDiscovery,
-  PluginCacheManager,
   createLegacyAuthAdapters,
+  PluginCacheManager,
 } from '@backstage/backend-common';
 import { CatalogClient } from '@backstage/catalog-client';
 import { stringifyEntityRef } from '@backstage/catalog-model';
@@ -38,20 +37,25 @@ import { createCacheMiddleware, TechDocsCache } from '../cache';
 import { CachedEntityLoader } from './CachedEntityLoader';
 import { DefaultDocsBuildStrategy } from './DefaultDocsBuildStrategy';
 import * as winston from 'winston';
-import { AuthService, HttpAuthService } from '@backstage/backend-plugin-api';
+import {
+  AuthService,
+  DiscoveryService,
+  HttpAuthService,
+} from '@backstage/backend-plugin-api';
 
 /**
  * Required dependencies for running TechDocs in the "out-of-the-box"
  * deployment configuration (prepare/generate/publish all in the Backend).
  *
  * @public
+ *
  */
 export type OutOfTheBoxDeploymentOptions = {
   preparers: PreparerBuilder;
   generators: GeneratorBuilder;
   publisher: PublisherBase;
   logger: winston.Logger;
-  discovery: PluginEndpointDiscovery;
+  discovery: DiscoveryService;
   database?: Knex; // TODO: Make database required when we're implementing database stuff.
   config: Config;
   cache: PluginCacheManager;
@@ -67,11 +71,12 @@ export type OutOfTheBoxDeploymentOptions = {
  * configuration (prepare/generate handled externally in CI/CD).
  *
  * @public
+ * @deprecated This type is only exported for legacy reasons and will be removed in the future.
  */
 export type RecommendedDeploymentOptions = {
   publisher: PublisherBase;
   logger: winston.Logger;
-  discovery: PluginEndpointDiscovery;
+  discovery: DiscoveryService;
   config: Config;
   cache: PluginCacheManager;
   docsBuildStrategy?: DocsBuildStrategy;
@@ -85,6 +90,7 @@ export type RecommendedDeploymentOptions = {
  * One of the two deployment configurations must be provided.
  *
  * @public
+ * @deprecated This type is only exported for legacy reasons and will be removed in the future.
  */
 export type RouterOptions =
   | RecommendedDeploymentOptions
@@ -94,7 +100,7 @@ export type RouterOptions =
  * Typeguard to help createRouter() understand when we are in a "recommended"
  * deployment vs. when we are in an out-of-the-box deployment configuration.
  *
- * * @public
+ * @public
  */
 function isOutOfTheBoxOption(
   opt: RouterOptions,
@@ -106,6 +112,8 @@ function isOutOfTheBoxOption(
  * Creates a techdocs router.
  *
  * @public
+ *@deprecated This function is only exported for legacy reasons and will be removed in the future.
+ * Please {@link https://backstage.io/docs/backend-system/building-backends/migrating | migrate } to use the new backend system and follow these {@link https://backstage.io/docs/features/techdocs/getting-started#new-backend-system | instructions } to install the user settings backend plugin.
  */
 export async function createRouter(
   options: RouterOptions,