Alex Pankratov :
Apr 07, 2021You need to make sure the files you want to back up are locally present in the OneDrive folder. Bvckup2 can't do that for you. It can only attempt to read them, which, in theory, should trigger their download, but if this download fails, you will get the errors you are seeing.
What you can do is instruct the program to skip such files if there's no local copies - https://bvckup2.com/support/forum/topic/1245