If the password is good then I don't think so. Every time a character is added to a password it's complexity increases exponentially. So not even a "quantum" computer could solve a long enough password. On the other hand, you want to be realistic and be able to remember your password. Or else you will find backing up a password in one place and keys in the other. If a wallet file is password protected and you forget or lose that password you also would lose access to your account so consider all of that when backing up.