First doc version

docs/guide/advanced.rst

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+Advanced
+========
+
+Temp Notes
+----------
+
+* Quick setup guide from start to end
+* we group snapshots by path when forgetting
+* explain rcb commands
+* examples of using restic directly
+* Explain what happens during backup process
+* Explain the backup process container
+
+Inner workings
+--------------
+
+* Each service in the compose setup is configured with a label
+  to enable backup of volumes or databases
+* When backup starts a new instance of the container is created
+  mapping in all the needed volumes. It will copy networks etc
+  to ensure databases can be reached
+* Volumes are mounted to `/volumes/<service_name>/<path>`
+  in the backup process container. `/volumes` is pushed into restic
+* Databases are backed up from stdin / dumps into restic using path
+  `/databases/<service_name>/dump.sql`
+* Cron triggers backup at 2AM every day