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One master Full back-up. After that only differentials.

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Need some help with my backup-plan customization.
I need one full backup of a system and then I only want differential backups. The full backup should never change. The differential should be based off this ”master” full backup. The differential backups that are created should never change after creation as well.
Finally, I want to set a max on the number of (last) differentials to keep.
Is this possible? How to do this?
If it is possible to do incremental backups on top of the master full + last differential, that would be nice.
The “never change” part is important part here in this question as these backups are written to a NAS (Synology) and are replicated over WAN to another site/NAS and I want to avoid further replication of these backups after they are created and replicated.
In my testing of consolidation, the full always change / or at least get a new date-time stamp, which trips the replication that I don’t want.
Thanks!

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I do not think it possible to do what you are saying here. Consolidation is the process used to compile all subsequent differential backups made from an original master that changes the master to include all the differentials. Further differential backups then are based on this new master. I see no way of retaining a single master, performing a number of differential backups to that master, discarding these differentials in some fashion and then begin differentials again. This to me says that the first round of differential backups become lost completely and the app is not designed to work that way.