Keep the home server's root backup scripts with the rest of its tooling

server/README.md

@@ -129,9 +129,11 @@ them.
 - `home/RESTORE.md`: how to restore the home server's `~/Server` from the
   ZFS backup.
 - `home/backup` and `home/systemd/`: the home server's backup trigger and its
-  root system units (`server-backup` nightly, `media-backup` weekly). The
-  scripts those units run live in `/usr/local/sbin` on that machine. They are
-  readable by root alone, so this tree has no copy of them.
+  root system units (`server-backup` nightly, `media-backup` weekly).
+- `home/server-backup` and `home/media-backup`: the scripts those units run.
+  On that machine they live in `/usr/local/sbin`, root-owned, because a
+  root-run script must not sit in a directory the user can write to. Restore
+  them there, not into `~/Server`.
 
 The VPS units carry `RequiresMountsFor=/home/gib/Media` because that host
 keeps its podman graphroot on an attached volume mounted there. The setting