Dropbox keeps a snapshot of every change in your Dropbox folder. Even if you and a colleague are working on the same document and end up creating your own versions, you can view and restore older versions of the file.
The period of time that older versions of files are available depends on the type of Dropbox account you have:
- For Dropbox Basic (free) and Plus users, file versions are available for 30 days
- For Dropbox Professional or Business users, files are available for 120 days
- For Dropbox Plus users who previously purchased extended version history, files are available for one full year