Lost of custom node through saving

[rezaar2MV53]

Hey, I’ve managed to lose a custom node through saving my work.
When I closed dynamo I was told that the custom node has not been stored, so I pressed yes. Next time i opened the file, custom node in the file was gone and got a red color.
I think I’ve managed to overwrite the file
Is there a method to get back the custom node content?

Thanks

[Michael_Kirschner2]

a .backup folder should be created in the same directory where you were editing your custom node.