I tried different things among them reinstalling BESR several times.
I got it to work when making sure the VSS services were running smoothly (some SQL VSS services were giving problems bca. SQL configuration) and after I deleted the destination folder and recreated it and shared it again.
It seems like BESR doesn't like if you map to the same folder twice or if .v2i files from a previous installtion are found in the destination folder.
I know it it not rational, but others have mentioned it, and it works for me now....??!!
Please close question.