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I just received this error while creating a backup to a USB thumb drive. The thumb drive has 230GB of free space which is much more than is needed by the backup. I tried to attach an image of the error message; but couldn't get that to work. Here is an OCR of the screen capture:

The backup has failed to complete due to the following:
System.Exception: There is not enough space on the disk. (Exception from HRESULT:
Ox80070070)
at System.Runtime.ExceptionServices.ExceptionDispatchlnfo.ThrowO + Ox21
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task) + Ox70
at
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(T
ask)+ Ox38
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task) + Ox17
at System.Runtime.CompilerServices.TaskAwaiter'1 .GetResult() + Ox10
at Mobi leSheetsPro.Preference.StartBackupAsyncTask. < Do I nBackground > d_14.MoveNext()
+ Oxbaf

I solved the problem. I had the thumb drive formatted as FAT32. Reformatting to ExFAT worked.