I have a time machine backup of my OSX El Capitan. I am having problems with signing into iCloud, but I've noticed if I go to Mavericks, which is the original OSX on my MBP it's ok. Can I put a Time Machine back up on El Capitan on Mavericks without putting the OS on or must I reload the programs I had on it before? If I can use time machine without OSX El Capitan, how is it done, please?