I think I am looking at a Time Capsule. (1) I want to have a shared hard drive space on my network for access by 2 iMacs and one PC. Which would be quicker access, a USB Flash Drive (connected to the Time Capsule's USB port) or using part of the TC's hard drive (partitioned in advance of course)? How much quicker would this be than the other option? (2) I'm still not sure if I'm going with TC or Airport Extreme, so if question 1 tells me that using TC for backups is better, then is using USB Flash any good (which is what I'll have to do with Airport Extreme of course), or is it too slow due to it being through USB on the network? (2) Do I need a NAS with the TC to use my USB Flash Drive? I thought not as I thought the TC was sort of a NAS, but I hear people still talking about the two together. (3) Does the TC slow down the Mac at all when it's backing up? When is the backing up conducted? Can it back up whilst a Mac is sleeping? (4) I hear issues with 5ghz / n mode. Is this ture? What is the solution? Basicsally I currently use a g router. All devices are g or n, except one which is b only, but I can connect that wired if need be. Thanks a lot!