I uninstall apps I never use (have a mac, so that'd be garage band, etc), use the CleanMyMac app regularly (it's not free but I'd say it more than makes up for it in the performance improvement I receive when I run it, they have a pc version too), and I do battery cycle it (although I don't let it get down below 20/25% because I'm paranoid about it dying on me). Also, BACK YOUR STUFF UP. Use a service, do it yourself, but take it as seriously as you take your taxes or whatever you take seriously. No, maybe you won't lose all your work or whatever, but the hassle of having to spend time trying to recover your work from random digital places/redownload all your articles from Jstor on a new or factory-reset computer is something that will be overwhelming in the extreme.