A backup file is automatically created each time you save your project. To restore a backup file, go to Menu > Project > Open Backup File. The Restore Backup File dialog window will show you a list of all the backup files for your current project.
In case something went wrong (corrupted project file, unwanted change, …), you can now restore a previous version of the file using this feature. Just select the version you want and click Open.
Kdenlive keeps up to 20 versions of your project file in the last hour, 20 versions from the current day, 20 versions in the last 7 days and 20 older versions, which should be sufficient to recover from any problem.
Open.