{
  pkgs,
  lib,
  config,
  ...
}:
with lib;
let
  cfg = config.global.fs.zfs.replication;
in
mkIf cfg.enable {
  services.syncoid = {
    enable = mkDefault true;
    interval = mkDefault "daily";
    sshKey = mkDefault "/var/lib/syncoid/.ssh/id_ed25519";
    commonArgs = [
      "--recursive"
      "--mbuffer-size=128M"
      "--delete-target-snapshots"
      "--sshport=${toString cfg.port}"
    ];
    localSourceAllow = mkOptionDefault [ "mount" ];

    commands =
      (lists.foldr (
        name: commands:
        commands
        // {
          "${config.global.fs.store}/${name}" = {
            inherit (cfg) sendOptions;
            target = "${cfg.remote}/${name}";
          };
        }
      ) { })
        cfg.datasets;
  };

  users.users.syncoid.uid = 82;
  users.groups.syncoid.gid = 82;
  environment.persistence."/nix/persist/fhs".directories = [ "/var/lib/syncoid" ];
}