As part of my backup strategy I plan to use an external hdd (which I generally keep off line -- I also use a internal backup hdd -- both are backups for my boot and home dir drives). I want to put the external hdd in the OWC Mercury Elite Pro "Classic" enclosure which accepts eSATA, firewire 400/800, and USB. I prefer those cases since I've used it's predecessor in previous years and they have proven very reliable. I know I can back up through fw800 (usb of course is slower than the firewire). But I was considering using eSata instead for even faster backups. I assume I can do this if I stick in a eSATA PCIe card in my 2010 mac pro. The two cards I am considering are from OWC: 1. NewerTech MAXPower 6G PCIe eSATA RAID Controller card 2. NewerTech MAXPower eSATA 6G PCIe 2.0 Controller card Card 1 appears to be a more full featured card (and more expensive) than card 2 and neither of these cards require an extra driver (which I guess is why I didn't consider the Sonnet Tempo SATA E2P). Will either of these cards work? Any suggestions for other cards for a 2010 mac pro? I realize that I cannot boot through either of these cards but I really wouldn't need to do that anyhow (unless something really catastrophic happens). Besides I could always use the fw800 if I ever needed that. [Hmm, what happens if both fw800 and eSATA are connected?] Update - some additional questions: I just thought of two more questions relating to the use of these eSATA cards: 1. With the disk mounted through eSATA, can the system sleep just as if the eSATA wasn't attached or the card in the PCIe slot? 2. Does the eSATA-connected disk need to be on when the system is booted or can turn on the drive and mount it after boot, i.e., like with fw and usb? So is all this really worth it? How much of a transfer speed boost can I expect from fw800 to eSATA considering (I assume) that this is somewhat dependent on the efficiency of the external enclosure's eSATA interface? Finally, although I prefer the enclosure I mentioned are there any opinions on enclosures that may be more efficient than that one? Remember I really only need an enclosure that can hold one drive. If in the future I need an additional drive I can always just get an additional enclosure. Thanks in advance for your opinions.