A change journal provides a persistent log of all changes made to files on a volume. As files, directories, and other NTFS file system objects are added, deleted, and modified, NTFS enters records into the change journal, one for each volume on the computer. Each record indicates the type of change and the object changed.
When you create a protection group, Data Protection Manager (DPM) allocates 300 MB of disk space on the data source volume of the protected computer to store the change journal. It is recommended that you do not change the default allocations until after you monitor disk usage for the protection group.
To modify allocated space for the change journal
In DPM Administrator Console, on the navigation bar, click Protection.
Select the protection group for which you want to modify the allocated space for the change journal.
In the Actions pane, click Modify disk allocation.
On the Protected Computer tab, enter a value in the Space Allocated box.
Note The default disk space is 300 MB. You can increase, but not decrease, the space allocated for the change journal.