Trying to do a system state backup on Windows Server 2016 - it had been working prior to doing some disk upgrades (including system drive). However now it is throwing an error, and saying there are no files to back up.

Error:
your backup plan System State COMPLETED WITH WARNINGS, please see below for more details.


ERROR
• An error occurredd (code: 1003)
None of the items included in backup were backed up. Detailed error: The filename, directory name, or volume label syntax is incorrect


I deleted and re-created the System State backup task (I had to use the "Image Based Backup (Legacy)" option, but same result.

I am using Backup Server Edition 7.8.7.59

Thank you for any help!!