diff --git a/swarm/seafile.yml b/swarm/seafile.yml
index 402c4b5..306e62c 100644
--- a/swarm/seafile.yml
+++ b/swarm/seafile.yml
@@ -142,13 +142,13 @@ services:
   backups:
     image: ${SEAFILE_MARIADB_IMAGE_TAG}
     command: >-
-      sh -c 'sleep $BACKUP_INIT_SLEEP &&
+      sh -c "sleep $$BACKUP_INIT_SLEEP &&
       while true; do
-        mariadb-dump -h mariadb -u $SEAFILE_MYSQL_DB_USER -p"$SEAFILE_MYSQL_DB_PASSWORD" --all-databases | gzip > "$MARIADB_BACKUPS_PATH/$MARIADB_BACKUP_NAME-$(date '+%Y-%m-%d_%H-%M').gz" &&
-        tar -zcpf $DATA_BACKUPS_PATH/$DATA_BACKUP_NAME-$(date "+%Y-%m-%d_%H-%M").tar.gz $DATA_PATH &&
-        find $MARIADB_BACKUPS_PATH -type f -mtime +$MARIADB_BACKUP_PRUNE_DAYS | xargs rm -f &&
-        find $DATA_BACKUPS_PATH -type f -mtime +$DATA_BACKUP_PRUNE_DAYS | xargs rm -f;
-        sleep $BACKUP_INTERVAL; done'
+        mariadb-dump -h mariadb -u $$SEAFILE_MYSQL_DB_USER -p\"$$SEAFILE_MYSQL_DB_PASSWORD\" --all-databases | gzip > \"$$MARIADB_BACKUPS_PATH/$$MARIADB_BACKUP_NAME-$$(date '+%Y-%m-%d_%H-%M').gz\" &&
+        tar -zcpf $$DATA_BACKUPS_PATH/$$DATA_BACKUP_NAME-$$(date \"+%Y-%m-%d_%H-%M\").tar.gz $$DATA_PATH &&
+        find $$MARIADB_BACKUPS_PATH -type f -mtime +$$MARIADB_BACKUP_PRUNE_DAYS | xargs rm -f &&
+        find $$DATA_BACKUPS_PATH -type f -mtime +$$DATA_BACKUP_PRUNE_DAYS | xargs rm -f;
+        sleep $$BACKUP_INTERVAL; done"
     volumes:
       - seafile-mariadb-backup:/var/lib/mysql
       - seafile-data:${DATA_PATH}