No progress due to message "Resource busy"

After upgrading to Winclone 9 and BigSur I am not able to save the Bootcamp partition. It says that the resource is busy. Before it worked always without any problems. What can I do?

2020-12-07T08:24:57+01:00:hiberfil exists…probing…
2020-12-07T08:25:02+01:00:We have Windows, but no BOOT folder, so checking to see if there is another partition on the same drive that has the folder. If so, we have a split boot config, and will grab the boot files
2020-12-07T08:25:13+01:00:Setting to not sleep…
2020-12-07T08:25:13+01:00:Writing Version of Windows to Image
2020-12-07T08:25:16+01:00:Saving Partition Type, 2.000000% complete
o SIP. Ignoring and returning 0x07
2020-12-07T08:25:16+01:00:Saving Filesize, 3.000000% complete
2020-12-07T08:25:18+01:00:Executing “ntfslabel -f -f /dev/disk0s3”
2020-12-07T08:25:19+01:00:Error opening ‘/dev/disk0s3’: Resource busy
Failed to mount ‘/dev/disk0s3’: Resource busy
Access is denied because the NTFS volume is already exclusively opened.
The volume may be already mounted, or another software may use it which
could be identified for example by the help of the ‘fuser’ command.

2020-12-07T08:25:53+01:00:Starting Helper Tool
2020-12-07T08:25:53+01:00:setting up listener for mach service com.twocanoes.WincloneHelper
2020-12-07T08:25:53+01:00:Getting new connection request
2020-12-07T08:25:53+01:00:Helper tool error: User Cancelled
2020-12-07T08:25:54+01:00:Setting the system to allow sleep…

This is related to backup software, anti virus, or other processes scanning the drive after it is restored.