nixfiles/hosts/hetzner-vm/profiles/restic.nix

{
  lib,
  config,
  pkgs,
  ...
}: let
  secrets = config.services.secrets.secrets;
  mail_config = config.mailserver;

  backupPrepareCommand = "${
    (pkgs.writeShellScriptBin "backupPrepareCommand" ''
      systemctl start ${
        lib.concatStringsSep " "
        (lib.forEach config.services.postgresqlBackup.databases
          (db: "postgresqlBackup-${db}"))
      } --wait
    '')
  }/bin/backupPrepareCommand";
in {
  environment.systemPackages = with pkgs; [
    restic

    (pkgs.writeShellScriptBin "restic-hetzner-vm" ''
      env \
        RESTIC_PASSWORD_FILE=${secrets.restic_password.path} \
        $(cat ${secrets.restic_env.path}) \
      ${pkgs.restic}/bin/restic $@
    '')
  ];

  services.restic.backups.hetzner-vm = {
    user = "root";
    paths = [
      "/var/lib/acme"

      # Quassel & Invidious
      "/var/backup/postgresql"
      "/home/quassel/.config/quassel-irc.org"

      # mail
      mail_config.vmail_config.directory
      mail_config.sieve_directory
      mail_config.dkim_directory
      "/var/lib/redis-rspamd"
    ];

    # repository is overrided in environmentFile to contain auth
    # make sure to keep up to date when changing repository
    repository = "rest:https://storage-restic.owo.monster/HetznerVM";
    passwordFile = "${secrets.restic_password.path}";
    environmentFile = "${secrets.restic_env.path}";

    pruneOpts = [
      "--keep-last 20"
    ];

    timerConfig = {
      OnBootSec = "1m";
      OnCalendar = "daily";
    };

    inherit backupPrepareCommand;
  };

  services.postgresqlBackup = {
    enable = true;
    backupAll = false;
    databases = ["postgres" "quassel" "roundcube"];
    compression = "zstd";
  };
}