Decided 2026-08-28: instances are protected by replication (sdb now, nuc after FTTH, ks2 push in between), their data/DBs/configs by restic-data — a third copy of instance filesystems in S3 was not worth the moving parts. backup-strategy.md now explains the replication-vs-backup split and the rebuild path when no replica survives; restic-backup.md §6 is marked SHELVED (script and empty repo kept). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>