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#21
As far as I have noticed, MR is using only one core/thread during backup which could make problems with dual core system as obviously system uses (at least) another core for own uses. Amount and speed of RAM can also make influence. Last but not least is I/O speed. Read (of source disk) and write (of target disk) are never same as their benchmarks suggest and usually far from manufacturer's specs.
SATA interface is not playing much of a role. Even SATA2 controller doesn't get saturated even with fastest SATA3 HDDs. It may look like it is faster with SATA3 disks but that's only because they are newer and inherently faster than older ones.
Speaking of MR backup speed, it takes 2 - 3 times longer to verify than to actually write .mrimg file.