What browser are you using, brand & version ?
Beleive it, with the wrong (faulty) browser eg IE5.5 SP2 it will take forever and then not even necessarily finish.
From memory a small file like that only takes less than 5 minutes, even a minute or 2..
Did you Verify the file after the backup was done to make sure it was a good backup ?
Try using Netscape v6, that always worked OK for me even on huge many Mb & Gb size backup files.
Regs
Ray