diff --git a/docker-compose.yml b/docker-compose.yml
index 2f729afb..84b263a4 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -26,6 +26,14 @@ services:
       GENERATED_IMAGES_S3_BUCKET: generated-images
       GENERATED_IMAGES_S3_ACCESS_KEY_FILE: /run/secrets/generated-images-access-key
       GENERATED_IMAGES_S3_SECRET_KEY_FILE: /run/secrets/generated-images-secret-key
+      # Recordings are kept for 24 hours; the same MinIO, its own bucket. The
+      # app key carries a second policy covering only audio-backups, so these
+      # can reuse the mounted credentials (see scripts/enable-audio-backup-bucket.js).
+      AUDIO_BACKUPS_S3_ENDPOINT: http://assets:9000
+      AUDIO_BACKUPS_S3_REGION: us-east-1
+      AUDIO_BACKUPS_S3_BUCKET: audio-backups
+      AUDIO_BACKUPS_S3_ACCESS_KEY_FILE: /run/secrets/generated-images-access-key
+      AUDIO_BACKUPS_S3_SECRET_KEY_FILE: /run/secrets/generated-images-secret-key
     volumes:
       - scribe-logs:/app/data/logs
       - clinical-assistant-mcp-data:/app/mcp-data:ro