Sync both server snapshots with what the live machines run, and keep their backup tooling

server/home/systemd/media-backup.service

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+[Unit]
+Description=Weekly copy of the Media pool to the Backup pool
+Documentation=file:///home/gib/Server/RESTORE.md
+After=zfs-mount.service
+Wants=zfs-mount.service
+RequiresMountsFor=/home/gib/Public /home/gib/.local/share/Backup
+
+[Service]
+Type=oneshot
+ExecStart=/usr/local/sbin/media-backup
+# 8.6 TB on the first run, deltas after. Generous, but bounded so a hung rsync
+# fails loudly instead of overlapping next week's fire.
+TimeoutStartSec=24h
+Nice=10
+IOSchedulingClass=best-effort
+IOSchedulingPriority=7
+
+[Install]
+WantedBy=multi-user.target

server/home/systemd/media-backup.timer

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+[Unit]
+Description=Weekly Media -> Backup pool copy
+
+[Timer]
+# Saturday 05:00. Clear of: the cron.daily zfs-auto-snapshot window (03:22-03:52),
+# timeshift (04:00), arr-queue-reconcile (04:31), and both ~/Server backups (01:00, 02:00).
+# Saturday specifically because Monday carries the Media scrub and Sunday has
+# raid-check (01:00), docker-prune (05:33) and dind-prune (06:03).
+# gib also runs Nextcloud's borg by hand roughly monthly and is, in his words,
+# not going to be doing that at 5 AM on a Saturday -- so the borg lock should be free.
+OnCalendar=Sat *-*-* 05:00:00
+RandomizedDelaySec=15m
+Persistent=true
+Unit=media-backup.service
+
+[Install]
+WantedBy=timers.target

server/home/systemd/server-backup.service

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+[Unit]
+Description=Back up /home/gib/Server to the ZFS pool
+Documentation=file:///home/gib/Server/RESTORE.md
+# The destination is on ZFS; do not run before the pool is up.
+After=zfs-mount.service docker.service
+Wants=zfs-mount.service
+RequiresMountsFor=/home/gib/Public
+
+[Service]
+Type=oneshot
+ExecStart=/usr/local/sbin/server-backup
+TimeoutStartSec=8h
+# This box is a daily driver running 145 containers. Stay out of the way.
+Nice=10
+IOSchedulingClass=best-effort
+IOSchedulingPriority=7
+
+[Install]
+WantedBy=multi-user.target

server/home/systemd/server-backup.timer

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+[Unit]
+Description=Daily backup of /home/gib/Server to the ZFS pool
+
+[Timer]
+# MUST finish before cron.daily fires zfs-auto-snapshot (~03:22-03:52); a snapshot that
+# catches a running rsync stores a partial backup as that day's history.
+# 02:00 also staggers against the VPS backup, which pushes into this same pool at 01:00.
+OnCalendar=*-*-* 02:00:00
+RandomizedDelaySec=10m
+Persistent=true
+Unit=server-backup.service
+
+[Install]
+WantedBy=timers.target