This option is effective only in Windows for a file-level backup of a data source that includes mounted volumes or cluster shared volumes.
This option is effective only when you select for backup a folder that is higher in the folder hierarchy than the mount point. (A mount point is a folder on which an additional volume is logically attached.)
During recovery of a parent folder, the mount point content will or will not be recovered, depending on whether the Mount points option for recovery is enabled or disabled.
The preset is: Disabled.
Tip. You can back up Hyper-V virtual machines residing on a cluster shared volume by backing up the required files or the entire volume with file-level backup. Just power off the virtual machines to be sure that they are backed up in a consistent state.
Example
Let's assume that the C:\Data1\ folder is a mount point for the mounted volume. The volume contains folders Folder1 and Folder2. You create a protection plan for file-level backup of your data.
If you select the check box for volume C and enable the Mount points option, the C:\Data1\ folder in your backup will contain Folder1 and Folder2. When recovering the backed-up data, be aware of proper using the Mount points option for recovery.
If you select the check box for volume C, and disable the Mount points option, the C:\Data1\ folder in your backup will be empty.
If you select the check box for the Data1, Folder1 or Folder2 folder, the checked folders will be included in the backup as ordinary folders, regardless of the state of the Mount points option.