By my understanding Time Machine is an incremental backup utility, non-bootable. Might be great, but I want a clone of my machine, updated daily. SD does that (as well as incremental), and is bootable to boot.
so I think it's two different audiences. TM for folks who never backup, and SD for those who value being able to go right back to work.
Nonetheless TM may make folks stop looking at good 3rd party solutions--let's hope not.
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