Hello Chris, i performed the following test:
Disabling compression: Same result Error EC8F17B7: Cannot create recovery points for job: LOCAL USB.
Error ED800012: The internal structure of the recovery point file (CRC Validation) is invalid, damaged or unsupported. (UMI:V-281-3215-6071)
Enabling Verify Recovery Point after Creation: Same Result Error EC8F17B7: Cannot create recovery points for job: LOCAL USB.
Error ED800012: The internal structure of the recovery point file (CRC Validation) is invalid, damaged or unsupported. (UMI:V-281-3215-6071)
Enabling Ignore Bad sectors during copy: another error Error EC8F17B7: Cannot create recovery points for job: LOCAL USB.
Error E4F3000F: Unexpected VSS writer error. Check the application event log for writer specific error. Failed VSS writers: BITS Writer. (UMI:V-281-3215-6071
Also the s this new message over every Symantec event logs : The description for Event ID 100 from source Symantec System Recovery cannot be found. Either the component that raises this event is not installed on your local computer or the installation is corrupted. You can install or repair the component on the local computer.
Its a laptop with just one SSD disk/volume.