You are right again kraada... After 15 mins of not responding, i finally see my backup file on my external HDD but there's only 491 MB. Does it sounds right for 47k players and 1.15 million hands database?
Understood, the backup really should have worked just fine, but don't delete your old database until you're certain things are working. Once you're sure it is you can delete it (in the PT3 Database Management window is the easiest place), though.