fix(docker): don't backup Nextcloud twice, instead put the AIO intern…

…al backup on the other ssd

This still keeps the important data backed up via our regular ones. And keeps total storage usage lower.

nixos/hosts/immortalis/containers.nix

@@ -125,6 +125,11 @@
               isReadOnly = false;
               mountPoint = "/var/garuda/docker-compose-runner/all-in-one";
             };
+            "nextcloud-local-backup" = {
+              hostPath = "/data_2/backup/nextcloud-aio";
+              isReadOnly = false;
+              mountPoint = "/var/garuda/backups/nextcloud";
+            };
           };
           forwardPorts = [
             {