Large Incremental back file - BackUP Exe 11d

Hi,

Problem: Very large Incremental files. Seems to be going forever until disk runs out of space.

I am doing backup every day of the week. Back up of two seperate departments>>>>makting and Accounting.

Saturday and Sundays I take full backups of both the dept.

Marketing Differential backups are fine all through the week. It starts at 8pm. Hardly take more than a 2 or 3 GB.

Accounting backup are incremental. They starts every night at 11pm. They seems to keep going until I run out of space. The average size of the files ranges over 150GB +. So, if each files is 150 x5 = 750GB.

Please help.

Thanks,

Wasim