Hi Helen,

First of all thanks for all yours help. Next, I was check all you said
that can be problem and on my server I have 250GB free space on HDD,
2GB RAM memory which is used 30% during backing up database, and
Administrator account + SYSDBA connected on DB. So, I think that all
works fine, and I found what error are writen on log file, maybe this
can help for some closer explanantion of my problem:

MASTER (Server) Fri Jan 18 23:33:25 2008
Database: D:\PROJECTS\BIF\DATA\MERKUR.FDB
internal gds software consistency check (cannot find record
fragment (248), file: dpm.cpp line: 1181)

P.S. I have some another DB and backup & restore proces go fine, but
this is my bigest db and I don't know what to do, it is work slow, Adam
said that backup and restore can help and I try to do this with that db.
When I try to export my db into SQL script I get sam error!

Thanks in advance...