diff --git a/modules/podman-postgresql.nix b/modules/podman-postgresql.nix
index ef7f878..ef0038d 100644
--- a/modules/podman-postgresql.nix
+++ b/modules/podman-postgresql.nix
@@ -61,6 +61,13 @@ in
             example = "daily";
           };
 
+          backupRetention = mkOption {
+            description = "The amount of backups to keep.";
+            type = types.int;
+            default = 28;
+            example = "2";
+          };
+
         };
       }));
     };
@@ -101,7 +108,11 @@ in
         description = "Backup of ${cfg.database} database";
         requisite = [ "podman-postgresql-${cfg.database}.service" ];
         serviceConfig = {
-          ExecStart = "${pkgs.bash}/bin/bash -c '${pkgs.podman}/bin/podman exec postgresql-${cfg.database} pg_dumpall -c -U ${cfg.user} | ${pkgs.zstd}/bin/zstd -o ${cfg.backupPath}/${cfg.database}/\$(${pkgs.coreutils}/bin/date +%%F_%%R).sql.zst'" ;
+          ExecStart =
+            let
+              retention = (toString cfg.backupRetention);
+            in
+              "${pkgs.bash}/bin/bash -c '${pkgs.podman}/bin/podman exec postgresql-${cfg.database} pg_dumpall -c -U ${cfg.user} | ${pkgs.zstd}/bin/zstd -o ${cfg.backupPath}/${cfg.database}/\$(${pkgs.coreutils}/bin/date +%%F_%%R).sql.zst && find ${cfg.backupPath}/${cfg.database} -type f | sort | head -n -${retention} | xargs rm -v'" ;
           Type = "oneshot";
         };
       };