diff --git a/backup.nix b/backup.nix
index 8970461..b2ad438 100644
--- a/backup.nix
+++ b/backup.nix
@@ -32,14 +32,20 @@ let
       s3Dir="s3://$bucket/\$\{prefix}misskey-$(date --iso-8601)"
       echo "Uploading backups to '$s3Dir'"
 
+      function upload () {
+        name="$1"
+
+        s3cmd put --config "${s3Cfg}" - "$s3Dir/$name"
+      }
+
       echo "Uploading config"
-      tar -cz -C /srv/misskey/.config . | s3cmd put --config "${s3Cfg}" - "$s3Dir/config.tar.gz"
+      tar -cz -C /srv/misskey/.config . | upload "config.tar.gz"
 
       echo "Dumping postgres database..."
-      pg_dump misskey | gzip | s3cmd put --config "${s3Cfg}" - "$s3Dir/pg_dump.sql.gz"
+      pg_dump misskey | gzip | upload "pg_dump.sql.gz"
 
       echo "Uploading redis database..."
-      tar -cz -C /var/lib/redis-misskey . | s3cmd put --config "${s3Cfg}" - "$s3Dir/redis.tar.gz"
+      tar -cz -C /var/lib/redis-misskey . | upload "redis.tar.gz"
 
       echo "Backup complete to '$s3Dir'"
     '';