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Cannot Mount Volume..../disk Os4

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I just purchased 2020 for Mac specifcally so that I could back up my system including the Boot Camp partition.  I keep getting failures, and the message is:   Cannot Mount Volume..../disk Os4

It just so happens that this disk Os4. it the Windows recovery partition inside the BootCamp partition.  I am not sure how I figured that out, but I do know that it is only 544 MB.  I had Acronis on Chat for over an hour yesterday, and we thought it was because I had BitLocker on.  But I turned that off, and it still give me the error.  HELP!

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