I'd like some advice on the best way to do the following drive swap: I have a late 2012 Mac mini with 1.12TB Fusion Drive (120GB SSD + 1TB HDD). After some research I've decided to change the drive configuration to 500GB SSD and 1TB HDD as two separate drives - no Fusion Drive. I intend to use the 500GB SSD for OS, apps and libraries etc. and the 1TB HDD just for Dropbox, eventually swapping out both for 1TB SSD when the prices drop further. The Fusion Drive is currently at around 700GB consisting of a 400GB Dropbox folder and 300GB for everything else. I already have the 500GB SSD and have cloned to it the contents of the Fusion Drive, excluding the Dropbox folder, using Super Duper and an external drive cable. I've copied the 400GB Dropbox folder to an external USB drive. I should also mention that I have a full Time Machine backup and a Backblaze online backup. I'm now ready to swap the drives but I'm undecided how to approach it: METHOD 1 - take out the 120GB SSD and replace with the new 500GB SSD. Leave the 1TB (ex-Fusion) drive in the Mac. Start up with the new SSD, format the 1TB HDD and copy my Dropbox folder to it. This method concerns me the most because it involves immediately splitting the Fusion Drive and destroying the original data. METHOD 2 - take out both the original drives and store for 'disaster recovery'. Put in the 500GB SSD and a new 1TB HDD. Start up with the new SSD and copy my Dropbox folder to the new 1TB HDD. The main downsides are that I'll have to buy a new 1TB internal drive and when I'm satisfied that the new drives are working I'll be left with a redundant (the original) 1TB internal drive. METHOD 3 - take out both the original drives and store for 'disaster recovery'. Put in the 500GB SSD and start up with it. Add a new 1TB external USB drive and copy my Dropbox folder to it. When I'm satisfied that the new drives are working, format the 1TB (ex-Fusion) drive, put it back in and use it for Dropbox. I'll be left with an unused 1TB external drive but I'll use that for a Super Duper clone of the OS drive incase of failure. The downside of this approach is having to open the Mac mini twice, not a pleasant thought at all. Any advice on how to proceed would be greatly appreciated. Which method would you use for swapping out the drives? Would you be happy with immediately splitting the Fusion Drive? Would Time Machine be reliable for a full system recovery if things should go wrong? Am I doing too much work upgrading an old machine? Thank you for reading this far. You're obviously one of my kind.