1

0

Both

Files on the storage system

All files in the backup path

2

2

0, 2, 3

Level-0 backup

Files in the backup path created since the level-0 backup

3

3

0, 2, 3

Level-2 backup

Files in the backup path created since the level-2 backup

4

1

0, 1, 4

Level-0 backup, because this is the most recent level that is lower than the level-1 backup

Files in the backup path created since the level-0 backup, including files that are in the level-2 and level-3 backups

5

4

0, 1, 4

The level-1 backup, because it is a lower level and is more recent than the level-0, level-2, or level-3 backups

Files created since the level-1 backup