System.IO.IOException when backing up to local folder

Bug with version 25.6.7.2367: “System.IO.IOException: The operation is not supported by the cloud sync provider.” when backing up file to local folder. The backup file does not save. The main file is stored on a cloud drive. If I save the backup file on the same cloud drive it works fine, but not if I save it to the local hard drive.

This is not bug in Manager

Your cloud provider does not support this