[Unit]
Description=Daily local NFS mirror to /mnt/backup

[Timer]
# Daily 02:00 — runs 3h before daily-backup (05:00) so the .changed-files
# manifest is populated and offsite-sync (06:00) ships both legs' deltas.
# Switched from weekly Mon 04:00 → daily 2026-05-26: steady-state delta is
# 10-20 min of mostly-metadata rsync, so the IO cost is negligible and it
# cuts non-CronJob app-data RPO from 7d to ~24h (matters for nextcloud
# shared files, audiobookshelf library, mailserver Maildir, etc.).
OnCalendar=*-*-* 02:00:00
Persistent=true
RandomizedDelaySec=15min

[Install]
WantedBy=timers.target