No, until now I did not know Deja Vu. But what I used was CarbonCopyCloner - but it did not work with 10.4 and 10.4.1 - now with 10.4.2 it works again. But cloning a drive with CCC takes a bit longer than with SuperDuper!
For what problem should Deja Vu maybe be responsible?
Ulf
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FES125 Pantheon