The Win10 build in backup has a few bugs & even MS now recommend not to use it .
Just why MS still cant come up with a fully working backup program is beyond me . That should have been no.1 priority , Mac has had a good backup built in for ages now.
Use Macrium , Im sure someone will chime in with help setting that up.
The 1st backup will take a long time . Then incrementals will be quicker after that
If your HD is slow it will take even longer
If its USB1 it will be ridiculously slow
If USB goes into power save, it may fail. If the PC goes into power save, it may fail.
The best bet is to start with a brand new (or newish) USB hard drive .
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