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The 3-2-1 rule
(alien.top)
We are digital librarians. Among us are represented the various reasons to keep data -- legal requirements, competitive requirements, uncertainty of permanence of cloud services, distaste for transmitting your data externally (e.g. government or corporate espionage), cultural and familial archivists, internet collapse preppers, and people who do it themselves so they're sure it's done right. Everyone has their reasons for curating the data they have decided to keep (either forever or For A Damn Long Time (tm) ). Along the way we have sought out like-minded individuals to exchange strategies, war stories, and cautionary tales of failures.
Yes, I follow the 3-2-1 backup rule
1st copy is my working data
2nd copy is to an external HDD
3rd copy is offsite to a cloud site
My backup copies are incremental, using a backup service (Arq)
I also have device backup, with my data auto-sync’d between devices (Mac and iPad)