[/B] If you already have one datafile out there that's 7.5 gigs and you're export size for the whole schema is only 3 gigs you're either very lucky (and thank yourself for it) or you're not exporting rows, in which case I hope this is not your primary means of backup.


no.. the possibilities are

a. export does not include some other users belong to that database
b. fragment

if rows are not exported the file size at any cost will not exceed
10m.. isnt it?.