Hi,
Please check if there’s any related event ID in clients, if yes, please provide the detailed error information.
Please run Vssadmin list writer both on your WHS and clients and check if there is any error.
Please try to run chkdsk /f /r for the disk.
Please check if the backup path has changed after we change the drive.
I found a similar thread in the following link and I hope it can give you some inspirations:
https://social.microsoft.com/Forums/en-US/b8afeed8-3c13-464e-ae73-4df5222bd8fa/client-computer-backup-service-wont-run-and-no-backups-are-occuring?forum=whs2011
Thanks for your time!
Best Regards,
Mico Mi
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