The AALog change log for System Volume Information has become inaccessible to the RR Agent service (permissions issue or file corruption). This prevents Core from reading changed blocks, forcing a base image.
The backups failed multiple times, causing the change logs to accumulate in both size and number. As a result, the System Volume Information folder became full, preventing the Agent from processing the change logs and causing subsequent backup failures. Removing the accumulated change logs allowed the backups to resume successfully.
* Removed the affected volume from protection.
* Refreshed the metadata.
* Forced a new base image.
* Waited for the base image backup to complete successfully, after which incremental backups resumed as expected.
