Lena continuously backups successive versions of a file and lets you consult them easily and to restore older versions if necessary.

To do so, right click on a file in the explorer and select File versions:

It opens the list of the successives versions of this file. The versions are listed from the most recent one (at the top ①) to the oldest one (at the bottom). You can consult any of the older versions of your document ② and restore it in place of the current one ③.