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Windows backup fails with error 0x81000019 on a Mac using Bootcamp
My daughter has a MacBook on which we successfully managed to install Windows 7 using the Bootcamp facility. (Nobody in the family had any experience with Macs so running Windows was seen as the easiest option). I used to run the Windows 7 backup utility for her. (Whether a restore would ever have been possible, I do not know, but that's another question!) Last week, after much prompting, we upgraded it to Windows 10. Everything appeared to go smoothly. However, when I ran the Windows 7 backup utility buried within Windows 10, it failed with error 0x81000019.
I've looked at solutions on the internet, including under SevenForums.com, but few mention having the problem running under Bootcamp. A number involve using tools to change partition sizes. However, the Apple support site seems to infer that one shouldn't use third party tools to change partitions made by Bootcamp. Another solution mentioned assigning a drive letter to the Recovery partition. However, all options seemed to be disabled when I attempted that avenue.
It may be a long shot, but has anyone got any suggestions?