Looking to hear any real-world performance experience on a RAID 1 Mirror external hard drive solution. Considering this: http://eshop.macsales.com/shop/firewire/1394/USB/EliteAL/MirrorRAID/ Will the mirroring be transparent to my MBP, and be handled by the enclosure, or is this type of setup going to be slower than using two separate external drives and using Time Machine to do backups? My concern with Time Machine is that I don't leave my MBP on when not in use, and don't want it to steal any bandwidth away while I'm working. But having two separate external drives does give me more options down the road. What do you think?