In some cases, consider creating separate policies for the backups that cross mount points and the backups that do not cross mount points.

For example, in one policy, Cross mount points is not enabled. The backup selection list contains only root (/). Only the root file system is backed up, and not the file systems that are mounted on it.

In another policy, enable Cross mount points. In the backup selection list, include root (/) to back up all the data on a client.