Alex Pankratov :
Oct 30, 2019
You can try changing the "sharing mode" which bvckup2 uses to open destination files . It defaults to just "read" sharing, but I think that setting it to "write" or "read/write" sharing will resolve the issue.
This is done by adding either
override to the job's config respectively.
See https://bvckup2.com/support/forum/topic/1140 for how to do that and don't forget to reload the job afterwards.
 https://docs.microsoft.com/en-us/windows/win32/fileio/creating-and-opening-files, Ctrl-F for "An application also uses".