feat(fuchsia): implement backup strategy with explicit home paths
Add snapper and borgbackup for fuchsia home directory backups: Snapper Configuration: - Hourly snapshots of /home/sajenim - Retention: 24 hourly, 7 daily, 4 weekly, 12 monthly - Stored in nested .snapshots subvolume Borgbackup Onsite: - Backup to viridian over SSH (local network) - Target: ssh://viridian/srv/borg-repo/fuchsia - Hourly backups, unencrypted, deduplicated - Same retention as snapper Borgbackup Offsite: - Backup to borgbase (internet) - Target: li9kg944@li9kg944.repo.borgbase.com:repo - Daily backups, encrypted (repokey-blake2), deduplicated - Retention: 7 daily, 4 weekly, 12 monthly Explicit Home Paths (valuable user data only): - Documents, Pictures, Videos, Music, Downloads, Academics, Notes - Dotfiles: .ssh, .gnupg System Persist Data: - SSH host keys, machine-id, nixos state - Bluetooth, NetworkManager configurations Intentionally Excluded: - .config (managed declaratively via home-manager) - .repositories (cloneable from GitHub) - .cache and build artifacts Treats viridian as central backup server, maintaining 3-2-1 strategy (3 copies, 2 locations, 1 offsite). chore(viridian): remove unused inputs parameter from borgbackup offsite
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6 changed files with 200 additions and 1 deletions
6
nixos/fuchsia/services/borgbackup/default.nix
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6
nixos/fuchsia/services/borgbackup/default.nix
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{...}: {
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imports = [
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./offsite.nix
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./onsite.nix
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];
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}
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86
nixos/fuchsia/services/borgbackup/offsite.nix
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86
nixos/fuchsia/services/borgbackup/offsite.nix
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{
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config,
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pkgs,
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...
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}: {
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# Encrypted passphrase for offsite borgbackup repository
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age.secrets.borgbackup = {
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rekeyFile = ./passphrase.age;
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};
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# Create staging directory before borg service starts
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systemd.tmpfiles.rules = [
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"d /.staging-offsite 0755 root root -"
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];
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services.borgbackup.jobs."offsite" = {
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# Allow writing to staging directory
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readWritePaths = [ "/.staging-offsite" ];
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# Create staging snapshots before backup (independent from onsite)
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preHook = ''
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# Create read-only staging snapshots for home directory
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${pkgs.btrfs-progs}/bin/btrfs subvolume snapshot -r \
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"/home/sajenim" "/.staging-offsite/home"
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'';
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# Backup explicit home directories and persistent files
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paths = [
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# Home directories (valuable user data only)
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"/.staging-offsite/home/Documents"
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"/.staging-offsite/home/Pictures"
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"/.staging-offsite/home/Videos"
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"/.staging-offsite/home/Music"
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"/.staging-offsite/home/Downloads"
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"/.staging-offsite/home/Academics"
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"/.staging-offsite/home/Notes"
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# Dotfiles (critical user configuration)
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"/.staging-offsite/home/.ssh"
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"/.staging-offsite/home/.gnupg"
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# Files from persist.nix (restore to /persist)
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"/etc/machine-id"
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"/etc/ssh/ssh_host_rsa_key"
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"/etc/ssh/ssh_host_rsa_key.pub"
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"/etc/ssh/ssh_host_ed25519_key"
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"/etc/ssh/ssh_host_ed25519_key.pub"
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# Directories from persist.nix (restore to /persist)
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"/var/lib/bluetooth"
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"/var/lib/nixos"
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"/var/lib/private"
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"/etc/NetworkManager/system-connections"
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];
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# Remove staging snapshots after backup completes
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postHook = ''
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${pkgs.btrfs-progs}/bin/btrfs subvolume delete \
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"/.staging-offsite/home"
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'';
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# Remote repository configuration
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repo = "li9kg944@li9kg944.repo.borgbase.com:repo";
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encryption = {
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mode = "repokey-blake2";
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passCommand = "cat ${config.age.secrets.borgbackup.path}";
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};
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environment.BORG_RSH = "ssh -i /etc/ssh/ssh_host_ed25519_key";
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compression = "zstd,9";
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startAt = "daily";
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# Retention policy for daily remote backups
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prune.keep = {
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daily = 7; # Keep 7 daily backups (1 week)
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weekly = 4; # Keep 4 weekly backups (1 month)
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monthly = 12; # Keep 12 monthly backups (1 year)
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};
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};
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# SSH host keys for borgbase.com
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programs.ssh.knownHostsFiles = [
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./borgbase_hosts
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];
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}
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84
nixos/fuchsia/services/borgbackup/onsite.nix
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84
nixos/fuchsia/services/borgbackup/onsite.nix
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{
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config,
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pkgs,
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...
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}: let
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hostname = config.networking.hostName;
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in {
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# Create staging directory before borg service starts
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systemd.tmpfiles.rules = [
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"d /.staging-onsite 0755 root root -"
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];
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services.borgbackup.jobs."onsite" = {
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# Allow writing to staging directory
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readWritePaths = [ "/.staging-onsite" ];
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# Create staging snapshots before backup (independent from offsite)
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preHook = ''
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# Create read-only staging snapshots for home directory
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${pkgs.btrfs-progs}/bin/btrfs subvolume snapshot -r \
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"/home/sajenim" "/.staging-onsite/home"
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'';
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# Backup explicit home directories and persistent files
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paths = [
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# Home directories (valuable user data only)
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"/.staging-onsite/home/Documents"
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"/.staging-onsite/home/Pictures"
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"/.staging-onsite/home/Videos"
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"/.staging-onsite/home/Music"
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"/.staging-onsite/home/Downloads"
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"/.staging-onsite/home/Academics"
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"/.staging-onsite/home/Notes"
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# Dotfiles (critical user configuration)
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"/.staging-onsite/home/.ssh"
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"/.staging-onsite/home/.gnupg"
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# Files from persist.nix (restore to /persist)
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"/etc/machine-id"
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"/etc/ssh/ssh_host_rsa_key"
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"/etc/ssh/ssh_host_rsa_key.pub"
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"/etc/ssh/ssh_host_ed25519_key"
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"/etc/ssh/ssh_host_ed25519_key.pub"
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# Directories from persist.nix (restore to /persist)
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"/var/lib/bluetooth"
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"/var/lib/nixos"
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"/var/lib/private"
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"/etc/NetworkManager/system-connections"
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];
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# Remove staging snapshots after backup completes
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postHook = ''
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${pkgs.btrfs-progs}/bin/btrfs subvolume delete \
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"/.staging-onsite/home"
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'';
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# Onsite repository configuration (backup to viridian over SSH)
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repo = "ssh://viridian/srv/borg-repo/${hostname}";
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# No encryption for onsite backups (physical security assumed)
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encryption.mode = "none";
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environment.BORG_RSH = "ssh -i /etc/ssh/ssh_host_ed25519_key";
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compression = "zstd,9";
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startAt = "hourly";
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# Match snapper retention policy
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prune.keep = {
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hourly = 24;
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daily = 7;
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weekly = 4;
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monthly = 12;
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};
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};
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# SSH host keys for viridian
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programs.ssh.knownHostsFiles = [
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./viridian_hosts
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];
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}
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@ -1,10 +1,12 @@
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{...}: {
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imports = [
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./amdgpu-clocks
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./borgbackup
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./flatpak
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./libinput
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./pipewire
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./printing
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./snapper
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./udev
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./xserver
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];
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22
nixos/fuchsia/services/snapper/default.nix
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22
nixos/fuchsia/services/snapper/default.nix
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{...}: {
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# Configure snapper for automated snapshots
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# Snapshots stored in nested .snapshots subvolume within home directory
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services.snapper = {
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configs = {
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# Home directory for user sajenim
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home = {
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SUBVOLUME = "/home/sajenim";
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ALLOW_USERS = ["sajenim"];
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TIMELINE_CREATE = true;
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TIMELINE_CLEANUP = true;
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# Tiered retention: 24h + 7d + 4w + 12m = ~1 year of snapshots
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TIMELINE_LIMIT_HOURLY = 24;
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TIMELINE_LIMIT_DAILY = 7;
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TIMELINE_LIMIT_WEEKLY = 4;
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TIMELINE_LIMIT_MONTHLY = 12;
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TIMELINE_LIMIT_YEARLY = 0;
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};
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};
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};
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}
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