On W10 Aniv. Update (and a few more after that) Home x64.

I have 3 hard drives in my PC. An SSD with C: on it, a 2nd 1TB drive for data, and a 3rd 1TB for the backup. That was working fine. However I ran out space so I purchased a 4TB External USB 3.0 drive to use.

This is the backup job now:

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This is the error I get?

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Plenty of space? Why?