Back up every store: the restic module holds node-backup, the stores contribute their dumps

ADR 0214 / to-be 43. restic keeps one repository per machine and takes a nightly snapshot per
module — 14 daily, 8 weekly, 6 monthly — and restores beside the live data, never over it. postgres,
mssql and mongodb contribute a consistent dump; minio, influxdb, the vault, mailu, gitea and
nextcloud the directories that hold their data.

modules/mailu/module.json

@@ -558,5 +558,12 @@
       "failregex": "^.*(?:imap|pop3|submission|managesieve)-login: .*\\(auth failed, \\d+ attempts(?: in \\d+ secs)?\\):.*rip=<HOST>(?:,|$)",
       "jail": "backend = systemd\njournalmatch = CONTAINER_NAME=mailu-front\nport = smtp,submission,submissions,imap,imaps,pop3,pop3s\nmaxretry = 3\nfindtime = 1d\nbantime = 1d"
     }
+  ],
+  "contributions": [
+    {
+      "seat": "node-backup",
+      "kind": "backup",
+      "content": "path ${dir:data-mail}\npath ${dir:data-dkim}\npath ${dir:data-data}\npath ${dir:data-dav}\npath ${dir:data-webmail}\n"
+    }
   ]
 }