A Full backup is performed the first time a backup is made. A Full backup consists of everything on the clients hard drive. Incremental backups are performed thereafter.
Incremental backups consist of files that have changed since the last backup.
In databases such as Exchange or Oracle where data is stored in a few very large files, a full backup each time may may be preferred. Copies are maintained in two physical locations in the event of a disaster. There are two exclude lists available, one on the client and a global list on the mainframe. These are used to eliminate files, directories or drives that contain information that does not need to be backed up, because it won't need to be restored or will be restored from original disks. You can customize your local exclude lists.