Time Machine
You mention backing up a machine you want to get rid of to Time Machine. Have you tried to use such a backup? In my experience you cannot access individual files and folders backed up from a machine you no longer have. You can only do a full restore. This really, really limites Time Machine's value. You can't archive a couple of backups and retrieve files from them. The only way is to dedicate a drive and do a full restore, extremely time consuming and unhelpful. Am I missing something?
Time Machine-OTHER, OS X Mavericks (10.9)