dotfiles/curacao/backup/default.nix

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{ pkgs, lib, ... }:
# MANU Snapper is not able to create the snapshot directory, so you'll need to do this after eventually running the backup script:
# sudo btrfs subvol create /mnt/razmo/$subvolume/.snapshots
let
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backup_subvolumes = [ "nixos" "home.rapido" "home.nixos" ];
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backup_app = pkgs.writeShellApplication {
name = "backup-subvolume";
runtimeInputs = with pkgs; [ coreutils btrfs-progs ];
text = builtins.readFile ./backup.sh;
};
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snapper_subvolumes = [ "nixos" "home.rapido" "home.razmo" "home.nixos" ];
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in
{
services =
let
default = {
# filesystem type
FSTYPE = "btrfs";
# run daily number cleanup
NUMBER_CLEANUP = true;
NUMBER_MIN_AGE = 1800;
NUMBER_LIMIT = 25;
# create hourly snapshots
TIMELINE_CREATE = true;
# cleanup hourly snapshots after some time
TIMELINE_CLEANUP = true;
TIMELINE_MIN_AGE = 1800;
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TIMELINE_LIMIT_HOURLY = "24";
TIMELINE_LIMIT_DAILY = "31";
TIMELINE_LIMIT_WEEKLY = "8";
TIMELINE_LIMIT_MONTHLY = "0";
TIMELINE_LIMIT_YEARLY = "0";
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# cleanup empty pre-post-pairs
EMPTY_PRE_POST_CLEANUP = true;
};
in
{
snapper.configs = lib.attrsets.mergeAttrsList (map (s: { "${s}" = default // { SUBVOLUME = "/mnt/razmo/${s}"; }; }) snapper_subvolumes);
};
systemd = {
services.bkp_rapido = {
description = "Make a snapshot of the SSD to the HDD";
before = [ "snapper-timeline.service" ];
serviceConfig = {
Type = "oneshot";
ExecStart = map (s: "${backup_app}/bin/backup-subvolume ${s}") backup_subvolumes;
};
# TODO Harden
};
timers.bkp_rapido = {
description = "Regular snapshot of SSD to HDD";
timerConfig = {
OnCalendar = "hourly";
};
wantedBy = [ "timers.target" ];
};
};
}