Fixes DNS resolution failures when persistent timers trigger backups
after system wake.
The NixOS borgbackup module adds network-online.target dependencies
to the timer when persistentTimer=true, but systemd timers don't pass
their dependencies to the services they trigger. This caused onsite
backups to start before the network was ready, resulting in "Could not
resolve hostname" errors.
Adding after/wants network-online.target directly to the service
ensures the backup waits for network availability regardless of how
it's triggered (timer or offsite's Wants= dependency).
Example failure (Oct 11, 07:43):
- Backup started at 07:43:43 (persistent timer caught up)
- DNS lookup failed: "Could not resolve hostname viridian.home.arpa"
- WiFi connected at 07:43:47 (4 seconds too late)
Applied to both fuchsia and viridian onsite backups.
Fixes multiple issues with borgbackup service coordination:
1. Race condition between onsite/offsite backups
- Set Type=oneshot to ensure services wait for completion
- Added Wants= dependency to trigger onsite when offsite runs
- Prevents snapshot path collision at /btrfs-subvolumes
2. Network unavailability after sleep/wake
- Added persistentTimer=true to onsite backups
- NixOS module now auto-adds network-online.target dependencies
- Fixes DNS resolution failures for SSH repos
3. Data loss risk from missed backups
- Persistent timers ensure backups run on wake if missed
- Protects work done before sleep from being unbackored
4. Duplicate onsite runs at midnight
- Removed 15-minute stagger (00:15 -> 00:00)
- Systemd deduplicates services in same transaction
- Onsite now runs once, not twice
Applied to both fuchsia and viridian for consistency.
Update backup paths to use actual persistent storage locations (/persist/*) rather than bind-mounted paths, making it clear where data truly resides and simplifying restore operations.
Changes staging directories from hidden to visible and aligns backup paths with actual BTRFS subvolume naming conventions for better clarity when browsing archives.
Adds persistentTimer=true to both fuchsia and viridian offsite backup configurations to ensure backups run on next boot if the system was asleep at the scheduled time. Without this, daily backups would be skipped entirely until the next scheduled run.
Add critical system state from persist.nix to borgbackup jobs:
- SSH host keys (required for borg authentication)
- machine-id and nixos state
- Network and bluetooth configurations
Paths mirror persist.nix configuration for maintainability.
Service-specific persist data (traefik, crowdsec) excluded -
will create dedicated subvolumes if/when needed.
Add automated snapshot and backup system with three independent tiers:
Snapper (hourly local snapshots):
- Configure snapper for all srv-* subvolumes
- Tiered retention: 24 hourly, 7 daily, 4 weekly, 12 monthly
- Snapshots stored at /.snapshots on viridian drive
- Provides fast operational rollback for user errors
Borgbackup onsite (hourly local backups):
- Independent staging snapshots at /.staging-onsite
- Repository on data drive at /srv/borg-repo
- Unencrypted (physical security assumed)
- Matches snapper retention policy
- Fast local disaster recovery
Borgbackup offsite (daily remote backups):
- Independent staging snapshots at /.staging-offsite
- Encrypted backups to borgbase repository
- Retention: 7 daily, 4 weekly, 12 monthly
- Remote disaster recovery with prune policy
Architecture decisions:
- Separate staging directories prevent job conflicts
- Staging snapshots decouple borg jobs from snapper
- Consistent zstd,9 compression across both borg jobs
- Special case handling for containers subvolume path
Migrate from path-based persistence (/persist/var/lib/*) to dedicated
BTRFS subvolumes for better data isolation and snapshot capabilities.
- Move valuable user-facing services to /srv/* with srv-* subvolumes:
- forgejo: git repositories and database
- opengist: paste data
- minecraft: game world data
- lighttpd: static web content
- containers: OCI container volumes
- Update home directory to use hm-sajenim subvolume on viridian disk
- Remove jupyterhub service (no longer in use)
- Update borgbackup paths to match new service locations
- Follow upstream service defaults where possible for maintainability
Services kept on /persist (disposable state):
- traefik, crowdsec, murmur
