Logging in to that "backup" is a potential bitcoin suicide...
Why?
Because you'd be giving your password to a withdrawal gateway to an unknown entity.
Then just don't log in.
The important thing it. Not matter what will come from MBT all Data is saved and available.
Including:
account balance of every single user
Saving book balance of every user
Stock of every user, including all buys and buy prices and sells and sell prices
and so on.
Most important is IMO the account balance --> unvisited funds that where just kept on the site.
And second the saving book balance, because of the statement that this funds where 100% captured by available capital.