High Sierra updated the way disk are formatted, essentially, bringing in a new system called APFS. This was a bit like stealing Superduper's map of the tube and telling it to visit every tube station in 24 hours;)

If you have an SSD start-up, High Sierra would have moved you to APFS.

So for now, it's a case of make sure you have another back-up eg Time Machine running as Superduper is not promising to back up all your files.

cheers
J

On 2 Nov 2017, at 9:39, [email protected] wrote:

Just seen this on the Shirt Pocket/Superduper website which may explain why I couldn’t backup not that I understand the file systems.

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