Not sure I understand what you mean. DGT-OmegaT is a standalone application, which makes no interaction with the network (except for TeamBase which is a separate project) so I don't see how it could be "hacked".
About loosing data, we cannot guarantee that the application has no bugs (this is true for any application, but remember that when you use free software this is explicitely without any guarantee) but we correct them if you send a report.
Hackers?
Not sure I understand what you mean. DGT-OmegaT is a standalone application, which makes no interaction with the network (except for TeamBase which is a separate project) so I don't see how it could be "hacked".
About loosing data, we cannot guarantee that the application has no bugs (this is true for any application, but remember that when you use free software this is explicitely without any guarantee) but we correct them if you send a report.