diff --git a/modules/backup.nix b/modules/backup.nix
index f913c7d8..936fa1e2 100644
--- a/modules/backup.nix
+++ b/modules/backup.nix
@@ -4,8 +4,8 @@
   config.services.postgresqlBackup = {
     enable = config.services.postgresql.enable;
     backupAll = true;
-    compression = "zsdt";
-    compressionLevel = 9;
+    compression = "zstd";
+    # compressionLevel = 9; # TODO: only available with 21.11
     pgdumpOptions = "--create --clean";
     startAt = "*-*-* 06:00:00";
   };