[DOMBCK-16] - DomBackup creates unreadable zip archives from files > 2GB (i.e. data will be lost) on Windows platforms!
releated to : http://www.openntf.org/internal/home.nsf/defect.xsp?action=openDocument&documentId=EDDBA4514F6E680786257F9D005A9FAC
7za.exe is used as an external compression tool. http://www.7-zip.de/download.html
Download 7Zip for your version ( 32/64 Bit ) and copy the command line tool 7za.exe to your Domino binary directory.