As a pc troubleshooter, they should got ethics. They should treat all customer pc as their pc. So in that case, when it comes to a situation that they need to do something related to the hard disk, they should do backup first.

In this case, we cannot blame TS due to she admit she know nothing regarding pc. So the one that claimed they KNOWS (the shop) but do a 'cincai' job like this is totally unacceptable.

Peace