The undo button will only get you so far—sometimes you just need to go back in time. It's called file versioning and here's how to use it.

Sometimes you can accidentally save the wrong version of an Excel document and want to recover the previous version of the file. Don't worry, it's feasible and will take only 5 minutes of your time.

Here's how to restore earlier document versions from some of the top apps and services. We also explain how to recover files from backups on different operating systems.