My MacBook Air used to be rock solid, but it has grown increasingly unstable over the past year. For example, this afternoon I can't switch to my other user account. I select the account from the fast user switching menu and nothing happens.
Part of me wants to just start over, reinstall and reconfigure OS X and all of my applications from scratch. It would probably solve a lot of problems. But I have so much work invested in my current configuration. It would take days or weeks to fully rebuild.
I'm thinking the next best option would be to wipe the drive and restore my latest Time Machine backup. I know that Time Machine doesn't back up everything -- caches, log files, etc. -- so maybe restoring from backup would have a "rejuvenating" effect. Or it could just be a complete waste of time.
In general, is reformatting and restoring from Time Machine a good way to get a Mac running like new? Or is it merely "worth a shot"?