Aldanet and Iurbano this problem I have lived also in my hands.
Veeam solution was a long process that needs to copy these files to be many and as time increases and the speed is obviously low.
What they told me was unit to draw together the files in a rar or iso , for example , so just veeam detects that it is one file which must be copied and faster.
Obviously I chose to leave B&R as backups of my virtual machines and I discarded the copy file option but should have left well programmed directly or not having taken this option here .
With Windows Explorer or robocopy takes much less safe and tested