When I migrated to SSD on my Mac mini, I kept the original 1 TB hard drive to store my old Mac OS data. That was just in the SSD migration failed. After two weeks of non-event, it was time to blow up my 1 TB hard drive. That means deleting the entire drive and using it as a backup drive for storing miscellaneous and less frequently accessed files. I’m not worried about the new SSD failing, because I have Time Machine. I can always restore the entire OS from my Time Machine backup. So, I dumped everything on the 1 TB drive and emptied the Trash Can. I took awhile, but now I have all that real estate for storage.
Six months ago, I installed a SSD drive on my Mac Mini. The speed of the SSD drive was a welcome addition. System boot up was cut in half. Access to applications were almost instant. It was all fun until I started having problems with SSD drive. Constant hangs and constant reboots for several weeks took its toll. Thanks to Time Machine, I’m now restoring my entire drive back to my original hard drive which is not in use. The restore process should take a couple of hours or so. I expect my computer to be slower with the hard drive, but it should be more stable than my current SSD.