nixos-config/services/borg-backup.nix

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{ config, lib, pkgs, ... }:
with lib;
let cfg = config.my.services.borg-backup;
in {
options.my.services.borg-backup = {
enable = mkEnableOption "Enable Borg backups for this host";
repo = mkOption {
type = types.str;
default = null;
example = "deadbeef@deadbeef.repo.borgbase.com:repo";
description = "Borgbase repo info. Required.";
};
paths = mkOption {
type = types.listOf types.str;
default = [];
example = [
"/var/lib"
"/home"
];
description = "Paths to backup";
};
exclude = mkOption {
type = types.listOf types.str;
default = [];
example = [
# very large paths
"/var/lib/docker"
"/var/lib/systemd"
"/var/lib/libvirt"
# temporary files created by cargo and `go build`
"**/target"
"/home/*/go/bin"
"/home/*/go/pkg"
];
description = "Paths to exclude from backup";
};
};
config = mkIf cfg.enable {
services.borgbackup.jobs."borgbase" = {
paths = cfg.paths;
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exclude = cfg.exclude;
repo = cfg.repo;
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encryption = {
mode = "repokey-blake2";
passCommand = "cat /root/borgbackup/passphrase";
};
environment.BORG_RSH = "ssh -i /root/borgbackup/ssh_key";
extraCreateArgs = "--stats --list";
extraPruneArgs = "--stats --list";
doInit = true;
compression = "auto,zstd";
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startAt = "daily";
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prune.keep = {
daily = 7;
weekly = 4;
monthly = 6;
};
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};
};
}