diff --git a/roles/docker/templates/compose-files/restic.yml.j2 b/roles/docker/templates/compose-files/restic.yml.j2
index 1f2ed2b..333a7e5 100644
--- a/roles/docker/templates/compose-files/restic.yml.j2
+++ b/roles/docker/templates/compose-files/restic.yml.j2
@@ -14,6 +14,7 @@ services:
       RESTIC_BACKUP_ARGS: >-
         --tag datacoop-volumes
         --exclude '*.tmp'
+        --exclude '/mnt/volumes/mastodon/mastodon_data/cache/'
         --verbose
       RESTIC_FORGET_ARGS: >-
         --keep-last 10