Hi everyone..I am sure you will see lots of posts from me! Switching over to mac from the windows world! I got a mac air about a month ago and am working on my specs for my iMac when it comes out. I did search the forums and even saw a recent thread on external drives/ 2.0 vs thunderbolt, but I didn't want to hijack his thread since I have some basic questions too. My setup will be the imac will be my main computer 90% of the time. The air will be for travel / sitting on the couch etc. The air will also be another users main pc but she does not use it that much. So - first I know I want to back up my air and iMac..when I have it. 1. Can you explain the difference in "time capsule hardware" vs just another external hard drive? (the time capsule appears to be much more expensive then an external drive) 2. And when determinig space - do you match what you have in your actual air/mac? 3. Will I need one for each device. air and iMac? Then I figure I need to determine if I want to use my imac as the main storage for data/pics/video. Or just store externally. Seems better to store externally since you don't get to them that much. - does that back up - back up external devices too tho? External devices - can you use any - sometimes I ready specific MAC external drives. does that usually just mean it has a Thunderbolt connection. Trying to look at black friday sales coming up to help with setting up my new system but want to make sure I am looking for the right things: - do they have to say Mac compatible. - i know the connection matters for speed - so either Thunderbolt, or i can get an adapter like this I think : http://www.staples.com/Seagate-GoFlex-Portable-Thunderbolt-Adapter-STAE121/product_786137 External Drives I see: Seagate FreeAgent GoFlex 3TB Wireless Hard Drive at Staples - $129.99 - could not find a link for this one. Best Buy seagate http://www.bestbuy.com/site/Seagate+-+Backup+Plus+3TB+External+USB+3.0+Hard+Drive/5597959.p?id=1218671137972&skuId=5597959&AID=10474050&PID=2187655&SID=ebs4d6d820951650a8e27f1815d431271867529369269sbe&URL=http%3A%2F%2Fwww.bestbuy.com%2Fsite%2FSeagate%2B-%2BBackup%2BPlus%2B3TB%2BExternal%2BUSB%2B3.0%2BHard%2BDrive%2F5597959.p%3Fid%3D1218671137972%26amp%3BskuId%3D5597959&ref=39&CJPID=2187655&loc=01 I hope this wasn't too confusing. Basically just wanting to make sure I am ready! - back ups (time capsule or other external and how big and for 1 or both air and iMac) - what to look for when purchasing (does it have to say Mac or does that just mean thunderbolt) etc. Thanks for your help!!!