I am using nbackup from level 0 to 3 (year, month, week and day,
respectively) to backup my databases.

Let's suppose i have a database called TEST.FDB, and, after run
nbackup to make a level 3 backup, i make a backup/restore using gbak,
restoring it over the original TEST.FDB.

What happens in this case next time i run nbackup? Will it be affected?

Regards,

Fabiano.