How can I create installation disks or other backups so that going forward I can make sure to stay on the same platform on all computers in the house? I currently have a Mac Mini and two Macbook pros and see no reason to ever "upgrade" to Yosemite. I'll be buying another iMac soon and I'm not sure yet when exactly. I'd like to stay on Mavericks on all computers and not deal with new (mostly useless) stuff again. I'd rather stay with the bugs I know. I'm not the type who wants to learn a new interface and settings every year or so. So there must be a way to have a installation copy of Mavericks around that can go on all machines at all times if necessary. Thanks.