Does backup store anything on the C drive?

Hi,

I have been using Seagate backup, but the latest version of this is, 1 a memory hog, 2, it spends all kinds of time conferencing with the cloud, and I don't use the cloud option.But what really struck me was to find it was storing duplicate backup files on my C drive. 5G worth so far. needles to say, I deleted those. So, since I have Norton security with backup. It makes sense to use it. My question, does Norton store duplicates on the C drive? I would not want that. Thankyou. Vista OS SP2 up to date. NSWB latest version USB Backup Drive.