World crash.. backup isn't working.

[imoosey]

Playing last night my world crashed after placing a red lined item case from bibliocraft onto a furniture mod table. When I logged back into my account and clicked single player the world was gone. I have a backup saved to my desktop and when I go into the saves folder in attack of the bteam it says my world is still there. I added my backup to the saves folder anyway and then reopened the client but no worlds are showing up. 

 

 

i have tried redownloading the entire technic client and i have reset the bteam pack itself. 

 

my question is how do i properly add a world back to my "saves" folder. I'm on a mac. Thanks. 

[czzarr]

Is the backup world from before the crash happened? Was it playable before the world crashed?

Copying and pasting the backup world into the saves folder should work, unless the backup world is also corrupted.