The higher the level number, the more specific the incremental backup, meaning it will only include changes since the last backup of the immediately lower level For example, a level 3 backup will incl...The higher the level number, the more specific the incremental backup, meaning it will only include changes since the last backup of the immediately lower level For example, a level 3 backup will include changes since the last level 2, level 1, or level 0 backup, whichever is the most recent For example, a level 2 backup copies files modified since the last level 1 backup, a level 3 backup copies files modified since the last level 2 backup, and so on