> Either way, you do want to do compression regardless of 
> source (OS or backup program).  Most USB drives top out at 
> under 40MB/s transfer rate while the drives themselves can 
> sustain 60+.  The USB interface is the bottleneck and the 
> only way to minimize that is to shrink the amount of data.  
> Compression, obviously, does that.

Good point.  I did a test differential backup with no compression.  It took
2.5 _times_ as long as software compression.  I would not have guessed that
much of a difference.


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