4shared Sync is an amazing free application that links all of your computers together. It's the easiest way to back up and sync your ï¬?les. The 4shared Sync is an app that tracks changes in the folder on your computer and syncs any changes to the web account. All you have to do is to save the files in your 4shared Sync folder, and they will be synchronized with any computer, you are using. This enables you to get immediate access to any chosen mp3 track, video. of yours, and share it with friends, family, or colleagues.