Reconfiguring the Default Subclient Content
The default subclient serves as a catch-all to ensure that the software backs up all the data. Do not change the content of the default subclient.
Eliminate Backup Failures
To speed up the backup process and to avoid backup failures, you can filter out items which consistently fail ,for example locked system objects, system libraries, and operating system objects. For information on how to set filters for backups, see Defining Filters.
After you add the failed objects to the filter, run a full backup to remove them from backups.