I'm hoping someone here has a similar config to what I'm trying to accomplish. Currently my backup strategy (basically) involves two 3TB hard disks in a USB dock. Time Machine is set up to back up to both disks "Time Machine A" and "Time Machine B". Once a week I switch the disks, so it backs up to "A" for a week and then to "B" for a week. While I could theoretically keep "A" offsite while "B" is running, it's a logistical inconvenience. I'd like to have an offsite solution that's not timing-dependent (i.e. where I don't have to first retrieve the old offsite disk in order to swap it out). Also I don't like the interrupted archive, where I have daily archives for only every other week at any one time. What I'm thinking of doing is getting a 3TB Time Capsule and setting my Time Machine to back up only to that. I'd then plug my USB dock into the Time Capsule, and my current 3TB disks would become rotating offsite backups. What I'd like to do is use the Archive function in the AirPort Utility from time to time to back up everything on my TC to one of the 3TB disks, take that disk offsite, and then bring home the alternate disk to use for the next trip. I can't find much on how long it takes to make an archive either, and I know the TC must be offline for that to happen. Not a big deal if it's 10 hours (I'll just run it overnight when no new data is being generated) but if it takes 2-3 days to create the archive that's a problem since nothing will be backed up during that time. Anyone doing something similar?