They both work. I"m presuming your mean the low-end
software types, and they're more alike than different.
There's also a Silicon Image version that usually costs
about 1/3 to 1/2 of what either of those do. Lots of useful
numbers here:
If they are s/w types that means they can be configured to act as
backup devices. In that mode they would build a RAID 1 image on the
target drive and close it. At the next schedules time it repeats that
process. That way you always have a backup in case you corrupt your
boot disk.
There's also a Silicon Image version that usually costs
about 1/3 to 1/2 of what either of those do. Lots of useful
numbers here:
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