B4J Question error with auto backup

[HansDieter]

The Auto Backup doesn't for my. In the botton line of the IDE i get a red error like:
2/22/2023 5:53:12 AM Backup failed, Check File Export as Zip for more infornation.
What does i wrong?

 

[DonManfred]

Check File Export as Zip for more infornation.

Did you try File-Export as zip to see any additional informations?

 

[HansDieter]

Did you try File-Export as zip to see any additional informations?

That's it. I had one of the files in the file folder open for edit. This locked the file and the whole backup.