Reduced acceleration during the first full backup, after upgrade to versions 10.5 and 11.
Explanation:
In NetBackup versions 10.5 and 11, we have changed some metadata, which gets protected as part of the backup across releases. To track the newer metadata format, all objects are considered changed due to a mismatch in the metadata properties of the blob.
Workaround:
This is expected behavior.
After an upgrade, NetBackup does a full rescan backup to avoid dependency of images across releases.