diff --git a/src/e2ee/RustEngine.ts b/src/e2ee/RustEngine.ts
index f8ba1aca..d1b3bd83 100644
--- a/src/e2ee/RustEngine.ts
+++ b/src/e2ee/RustEngine.ts
@@ -18,7 +18,7 @@ import { MatrixClient } from "../MatrixClient";
 import { ICryptoRoomInformation } from "./ICryptoRoomInformation";
 import { EncryptionAlgorithm } from "../models/Crypto";
 import { EncryptionEvent } from "../models/events/EncryptionEvent";
-import { IKeyBackupInfoRetrieved, KeyBackupVersion } from "../models/KeyBackup";
+import { ICurve25519AuthData, IKeyBackupInfoRetrieved, KeyBackupVersion } from "../models/KeyBackup";
 
 /**
  * @internal
@@ -135,14 +135,14 @@ export class RustEngine {
     }
 
     public async enableKeyBackup(info: IKeyBackupInfoRetrieved) {
-        LogService.warn("RustEngine", "**STUB** Server-side key backups not yet implemented!");
         this.keyBackupVersion = info.version;
-        // await this.machine.enableBackupV1(info);
+        // TODO Error with message if the key backup uses an unsupported auth_data type
+        await this.machine.enableBackupV1((info.auth_data as ICurve25519AuthData).public_key, info.version);
     }
 
     public async disableKeyBackup() {
         this.keyBackupVersion = undefined;
-        // await this.machine.disableBackup();
+        await this.machine.disableBackup();
     }
 
     private async processKeysClaimRequest(request: KeysClaimRequest) {