{ lib, config, ... }:
let
  mkIf = lib.mkIf config.services.mysql.enable;
in
{

  pbsds.backup.paths = mkIf [ config.mysqlBackup.location ]; # "/var/backup/postgresql"

  services.mysqlBackup = mkIf {
    enable = true;
    databases = config.services.mysql.ensureDatabases;
    # calendar = "*-*-* 01:15:00"; # nightly (default)

    # there is now way to select no compression...
    # should be trivial to fix ;)
    # https://github.com/NixOS/nixpkgs/blob/89c2b2330e733d6cdb5eae7b899326930c2c0648/nixos/modules/services/backup/mysql-backup.nix#L23-L45
    # https://github.com/NixOS/nixpkgs/pull/364630
    # compressionAlg = "gzip";
    # compressionAlg = "xz";
    # compressionAlg = "zstd";
    # compressionLevel = null;
  };

}