If unity crashes or closes unexpectedly and some changes were not saved, there is a small chance to recover them. Unity makes a backup of all unsaved scenes and we can recover them before we open the project again.
WARNING
If you open again the project before doing this method, the backed up scenes disappear. Make sure to go through this steps before opening unity again.
1.- Access the Temp folder #
Go to your Unity project folder, and notice that the Temp folder has not been deleted (Because Unity did not close properly).
Locate the “_Backupscenes” folder and in there you will find all the backed up scenes.
For more information on the unity project folders you can check: Unity – Project File Structure
All the unsaved scenes will be named “0.backup, 1.backup, 2.backup …”
Usually you will only find a single file “0.backup” copy it.
2.- Move and rename the backed up scenes #
Return to the location where your saved scene is and paste the copyied file “0.backup”
Rename the file “0.backup” to “SceneName_Recovered.unity” (Or whatever name your scene had) and make sure to also change the file extension from “.backup” to “.unity”.
Now you can open unity again and open your recovered scene. From there you can copy the changes from the recovered scene to the original one, or delete the original one and continue from the recovered scene.