Deleted all my rems etc. Anyway to get them back?

I made a incredibly stupid mistake and deleted all my rems to re-upload only certain folders. But the file is too large, it just ends up crashing the browser. I have a .JSON backup of all the folders I wanted to reupload and a daily backup just in case.

I tried on the desktop app which was working for like 10% then I just got a white screen.
Is there anything I can do?

EDIT: The backup I downloaded worked well. A LOT faster than the.JSON for the folders.