Oh, so you can't generate the backup text? That's weird because it's a pretty simple function and I can't reproduce this problem in edge (or any browser).
Okay, so in Edge, press F12, then click on the "Console" tab. Are there any errors (should appear in red) showing? If so, drag the window so it fills up the screen, take a screenshot, and then send it to me.
Okay, hmm that's odd. Try entering this command into the console:
It [i]should[/i] belch out a giant wad of json, which is the raw form of your saved data. Don't post it in a wall post because it's probably lengthy, but rather, send it to me via PM and I'll see if I can replicate the error using it.
Click on the envelope icon by your avatar in the upper-left part of this page. And yeah, just paste it into a message, but if it's too long, you could always use a site like pastebin or google drive to host it. That said, did you use any "odd" characters in names or notes?
Found the problem. "Surge" somehow ended up with 1 or more invalid characters in his data so the base64 conversion was failing. Here's a version of your data without Surge's invalid characters:
You should be able to export normally now as long as you don't resave Surge...at least not until I can patch what's causing it, and I think I know what it is. Thanks for bringing this (rather obscure) issue to my attention. :)
Actually, no action needed. I just made a quick patch that will correct this mistake automatically for anyone affected by it. In case your curious, it had to do with the - in Matter - Energy Union being an unusual character (the long dash) instead of the normal - on your keyboard.