Installed an SSD into my MacMini late 2012 in the upper tray, HDD is in my lower tray. Formatted, partitioned with GUID blah blah blah the SSD the correct way. I wanted to copy over my time machine backup but couldn't decide how cause I had 7 backups over the past month. I don't think copying over the folder Backups.backupdb with all 7 folders was the correct way. So I just drag/dropped the last backup folder into my SSD, which according to its size made me think everything was in there (roughly around 400GB, which is how much my backup should've been). I then installed TRIM enabler and everything looked fine. The drive was showing up on my desktop. But when I went into Startup Disk to choose that disk over the HDD, I noticed it wasn't there. Only the HDD was there. I booted with Option key, again, nothing there except my HDD. Was I supposed to do a clean install of Yosemite then copied over the backup? Or was my mistake in the way I did the time machine backup copy?