Each storage backend has a default priority, assigned to any system mounts
created in ownCloud. mount.json can be manually modified to change these
priorities.
The priority order is as follows:
* Personal
* User
* Group
* Global
Within each mount type, the mount with the highest priority is active.
The storage backend defaults were chosen to be the following:
* Local - 150
* Remote storage - 100
* SMB / CIFS with OC login - 90