Backup Failed

Hi

A couple of days ago I started to receive this error message popup. Not sure what it really means or how to check / fix. Any ideas?

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Grindstone logs exceptions of this kind in a local directory. You can try going into Options to enable Diagnostic Tools, and then clicking Grindstone, Diagnostic Tools, and then Save Logged Exceptions. Once you do that, look for a file that was created when this error occurred and you can get more technical details.