|Freezing a drive only works with certain kinds of problem, and I don't think this is one of them. This is a risky procedure and often only increases the damage.|
All files of any importance need at least 1 backup copy, 2 or more backup copies if the files are of particular importance. There are many ways that data can be lost and you need to be prepared when (not if) something happens.
Data recovery is always hit or miss.