If I install Snow Leopard on an outside laptop internal SSD hard drive that I’m using for an external hard drive and then do a Time Machine backup to it from an iMac that has Mavericks on it, will my external SSD hard drive involuntarily upgrade it’s OSX system from Snow Leopard to Mavericks?...or will just the other non-Apple applications be backed up to it, or insignificant Apple program upgrades like the calculator, chess, dictionary, etc., etc. be upgraded?