When I was having restore issues, I re-flashed ColockworkMod Recovery from within Rom Manager, then it worked. If you can't run Rom Manager, I'm sure there are different ways to re-flash it.
Thanks to those who were trying to help me resolve this issue!
It has been resolved. Wanna know what it was??
I had renamed my backups and put spaces in the names. Like, you know, spaces between the words. I had NO IDEA that would cause a problem, but when I went in to a file explorer and removed the spaces, it restored no problem.
Hitting the donate button. Can't wait for a fully working build. Wifi worked perfectly for me, even better than perfect -- pages rendered very quickly. I loved it!! My biggest problems were the camera, and sometimes things just didn't display the way they should, like certain settings menus and such. I also really need a reliably working camera, I use my phone camera a ton. I can't donate much (recently unemployed college student) but this is just such an awesome project. I'll be watching and waiting on MIUI 'til a few more bugs are fixed!