The database is quite big, so it takes a lot of time to restore. The process outputs some normal messages and, in the end, after a lot of time, it prints out some strangers errors like "duplicate key", "constraint already exists", and other similar...
at the end, I've got a database 10 GB smaller than the original, which clearly indicates that some data was lost.
The versions are 8.4.5 (original) and 8.4.7 (restored).