[ Although he understands where Chekov is coming from, that's a whole different kind of disturbing. It's one thing that Rebecca might get a peek inside his brain, but storing a pattern of it? Yeah, that's a little scary. That said... ]
There's nothing to suggest that such a pattern doesn't already exist. After all, if this truly is a virtual environment — and it seems like it is — and people can return with no memory of it but still remember their lives back home, many times past the point of when they originally entered the prison, I don't think it's too much of a stretch to assume the Wardens have a backup somewhere.