nixos-config/modules/system/nextcloud/backups.nix

{
  config,
  pkgs,
  lib,
  ...
}:
let
  cfg = config.myConfig.nextcloud;

  user = config.users.users.nextcloud.name;
  inherit (config.users.users.nextcloud) group;
in
{
  options.myConfig.nextcloud.backups.enable = lib.mkEnableOption "";

  config = lib.mkIf cfg.backups.enable {
    systemd.tmpfiles.rules = [ "d ${cfg.dataDir}/backup 700 ${user} ${group} -" ];

    myConfig.resticBackup.nextcloud = {
      inherit user;
      healthchecks.enable = true;

      extraConfig = {
        backupPrepareCommand = ''
          ${lib.getExe' config.services.nextcloud.occ "nextcloud-occ"} maintenance:mode --on
          ${lib.getExe' config.services.postgresql.package "pg_dump"} nextcloud --format=custom --file=${cfg.dataDir}/backup/db.dump
        '';
        backupCleanupCommand = ''
          ${lib.getExe' config.services.nextcloud.occ "nextcloud-occ"} maintenance:mode --off
        '';
        paths = [
          "${cfg.dataDir}/home/data"
          "${cfg.dataDir}/home/config/config.php"
          "${cfg.dataDir}/backup"
        ];
      };
    };

    environment.systemPackages = [
      (pkgs.writeShellApplication {
        name = "nextcloud-restore";
        text = ''
          sudo --user=${user} ${lib.getExe' config.services.nextcloud.occ "nextcloud-occ"} maintenance:mode --on
          sudo --user=${user} restic-nextcloud restore --target / latest
          sudo --user=${user} pg_restore --clean --if-exists --dbname nextcloud ${cfg.dataDir}/backup/db.dump
          sudo --user=${user} ${lib.getExe' config.services.nextcloud.occ "nextcloud-occ"} maintenance:mode --off
        '';
      })
    ];
  };
}