Problem creating Grandfather, Father, Son backups

[admin]

Hello Admin,

thanks for your answer. Could you please explain more precisely:

For example, is it corret that in order to restore an image, these days' backups are required (after ">")

Day 1: Full Image > 1
Day 2: Incremental > 1,2
Day 3: Incremental > 1,2,3
Day 4: Differential > 1,4
Day 5: Incremental > 1,4,5
Day 6: Differential > 1,6
Day 7: Incremental > 1,6,7
Day 8: Incremental > 1,6,7,8

Does this mean that AS SOON AS A DIFFERENTIAL IMAGE has been created, the user may delete ALL OLDER incremental images. Future incrementals do not need those old incrementals because they will use the latest backup (the differential), and the remaining old differential images only need the initial Full Backup.

Is this correct? Are the numbers behind ">" (required backup files) correct?

This also means that instead of

Full_V1_1.DBI
Incremental_V2_1.DBI
Incremental_V3_1.DBI
Differential_V4_1.DBI
Incremental_V5_1.DBI
Differential_V6_1.DBI
Incremental_V7_1.DBI
Incremental_V8_1.DBI

One could also name the backup files like this to indicate their dependencies: The first 3-digit-block indicates "Full," the second "Diff", and the third "Inc":

Full_v001-000-000_1.DBI
Incremental_v001-000-001_1.DBI
Incremental_v001-000-002_1.DBI
Differential_v001-001-000.DBI
Incremental_v001-001-001_1.DBI
Differential_v001-002-000_1.DBI
Incremental_v001-002-001_1.DBI
Incremental_v001-002-002_1.DBI
Full_v002-000-000_1.DBI
...

The dependencies you describe for the backup versions are correct and yes users can delete old incremental backups after creating a new differential backup.