WTH: How are there no de-duplicating backups?

Backups are since around 09/24, I don’t think I have to say more (each singular backup is around 2GB):

I would even be happy with generational backups.

i.e
Keep daily backups for a week
Keep weekly backups for a month
Keep monthly backups for a year
Keep yearly backups for ???

Since lets face it, we typically only restore back a few days when we break something. The other backups would be more of a security if we notice something had been broken for a long time.

Bonus points if the time-frames/generations were configurable. (e.g I wanted daily backups for a fortnight, fortnightly backups for 3 months and 1/4 yearly (3 monthly) backups forever)

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