Preface: I am upgrading from a 2008 2.16 Ghz Intel Core 2 Duo iMac (back when they were white, lol) running Mac OSX 10.6.8 to the new retina iMac. I currently have 2 main external HD attached to my old Mac; one is a Time Machine to backup the Mac's internal 250GB; the other is a larger external designed to archive older files like pictures and videos. It got to the point where i was running out of space on the internal HD so photos and videos were automatically being saved to externals. Recently, however, the larger external failed. Unfortunately, because I didn't have an automated backup solution (Time Machine only backs up the main Mac HD), I needed to resort to a very expensive data recovery solution, something I hope I never have to do again, I learned my lession. My question is: now that I am switching to a new computer with internal 512GB SSD; what recommendations do you have for file management. I basically will keep as much on the main SSD if possible but large video files and archived photos will have to go to externals, which I need to have backed up. 1) Is there a way for a huge capacity Time Machine to backup BOTH the internal iMac SSD AND an external? 2) is there an automated solution for backing up external SSDs? Otherwise it's very annoying to have to copy everything from one external to another 3) I have read about NAS vs RAID vs SSD; to me speed is not critical and external SSD just do not seem to offer much value in terms of storage space. I will some day be working with 4K video and large video files but not in the near future. My priority is convenience of file management, and maximizing safety/backups ever since my external HD debacle. 4) I have heard about the benefit of RAID setups and Thunderbolt; if speed isn't critical to me right now, is USB 3.0 sufficient? Thunderbolt drives seem extremely expensive from what I have seen. 5) Any thoughts on Microsoft Onedrive or any cloud based storage solutions? Probably not the most efficient means of storage, right? 6) Strongly considering at least one form of cloud based storage since it would be nice to be able to access photos and things even when I am not at home. Any suggestions?