by Eugene Matusov.
Dear Colin--
Thanks for your reply.
I am running Moodle 2.9.1 that is supposed to allow 4GB back filesizes but I cannot make back up bigger than 2GB. Ken Task has a suspicion that the problem is rooted in my Windows 2012R platform , in some settings of IIS 8. I checked it but I couldn't find anything wrong in my settings that should allow to handle 4GB files. I cannot find any settings in PHP, MySQL or moodle that can solve the problem.
Any ideas?
Eugene