Why is my 1TB drive saying it's almost full, even though I don't have much on it?

Episode 1080 (1:09:54)

Diane from Chicago, IL

Leo says that just videos, images and MP3s can't fill up that much space all by itself. There has to be something else on the drive. Leo advises using a program called SpaceSniffer. It's free. Another is called WinderStat and TreeSize. Leo also thinks that Diane has backups on it. Lenovo has automated backups, and if it's backing up without deleting the old ones, it will get filled up pretty quickly.