How i can make backup in trial mamager?

[d3mad]

Or refer here

Backup problem with Chromium-based browsers

No. All my tests were on a Mac. Based on other comments, I will move this to bugs and change the title to reflect the actual problem. (Note, this is not the first time Chromium-based browsers have trouble where no others do.)

As it’s just been moved to bugs (but not this thread, because you really haven’t provided enough info —like browser version etc)