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backups: encrypted per-machine storage box sub-accounts, + coaxmetal, styx, acheron, yellow - #107
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October 19, 2026 09:34
Every machine now backs up into its own Hetzner storage box sub-account (isolation: one machine's ssh key can't read or delete another's archives), into ./borg in the sub-account's home. lass.backup.user replaces lass.backup.repo and enables the job; host, port 23 and the box's host key are module defaults, so a machine's backup.nix is only the sub-account. Repos are always encrypted (repokey-blake2). The passphrase comes from a per-machine clan vars generator borgbackup-repokey; it lives in the password store, so passphrase + repo are enough to restore. The borgbackup ssh key generator is unchanged. neoprism moves to a new repo on u550643-sub1 (doInit creates it); the old unencrypted repo u550643@...:/./neoprism is no longer referenced and is removed by hand. Its paths, excludes and hooks are unchanged. The job stays `hetzner`: with fresh repos nothing gains from a rename, and the unit name is used for the postBackup hooks. The timers get a fixed random delay of up to 1h after 03:00, so the machines sharing the box don't all start at once.
Each machine gets a backup.nix with its storage box sub-account (coaxmetal sub2, styx sub3, acheron sub4, the yellow container sub5); what is backed up is declared next to the services: - coaxmetal: the hermes home without caches, toolchains, git clones, node_modules and target dirs. Every *.db under .hermes (except cache/), also in subdirs such as cron/ and the matrix crypto store, is dumped with sqlite3 .backup into /var/backup/hermes, recreated each run so removed databases don't linger; the live files are excluded. - styx: n8n's DynamicUser state (/var/lib/private/n8n), its default SQLite database dumped. - acheron: zigbee2mqtt (devices, coordinator backup; database.db is JSON) and mosquitto's retained messages as plain copies. - yellow: jellyfin, sonarr, radarr, prowlarr, jellyseerr and sabnzbd configs with their SQLite databases dumped. Excluded: jellyfin metadata, logs and transcodes, servarr MediaCover and logs (also logs.db), jellyseerr cache and logs, sabnzbd's incomplete Downloads and logs. Media and downloads live in /var/download and are not backed up. A missing database fails the hook instead of sqlite3 creating an empty one. Grafana (coaxmetal, styx) is not backed up: datasources and dashboards are provisioned from the repo, admin password and secret key come from vars, anonymous users are viewers; both instances only have the four provisioned dashboards.
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Already deployed to neoprism, styx, acheron, yellow and coaxmetal from this branch; first backup into each encrypted sub-account repo succeeded (neoprism 12 min / 15 GB, coaxmetal 2 min, yellow 2 min, styx, acheron). Includes the generated public vars (ssh pubkeys).