CRC errors point to corrupt files, which may have caused by a crash, by a disk failure, by faulty memory or driver issues.
You did run chkdsk on all drives of your WHS as outlined
here?
You also may wish to check the Event log on the server (locally in Control Panel, Administrative Tools for errors and warnings).
If the problem is not a hardware issue, the best way still maybe to delete all backups and start them from the scratch.
Best greetings from Germany
Olaf