Something about retention policy isn't clear

[al3x]

Each user will have very different requirements.

True! For example I backup to my Synology NAS on a daily basis.

So that's one week of inc. backups, weekly differential backups and monthly full backups. Retention is set to keep 2 differential backups and 1 full.
Additionally the NAS has snapshot replication set to 7 days, so everything that got deleted by HBS is still kept for another 7 days.

I don't think such individual settings would fit in a preset