If by 3-2-1 you mean what I try to repeat to myself calmly when I lose my data, then yes

I have a 2-2-0 for now. The problem is with 100 TB of data, it's hard to find an offsite back up that is reasonable priced.
Everyone else seems to have parents or these things called "friends" that they can ask to hold onto. Wonder where I can find them.

Op, can you explain me what's this about in short? I'm a noob. :)

I do not follow it. We have an offline cloud copy and a physical copy at home. We don’t have anywhere to easily store a second copy that’s not at home, and I don’t want to update it yearly. I still suggest the 3 2 1 rule though: i know that if the cloud has an issue or my physical disk corrupts it could be a serious problem.

For me I used the cloud as my offsite backup but it’s only the most important stuff and it’s scattered between several Gmail accounts iCloud and OneDrive. Working on consolidation but right now it’s backed up somewhere other than my server. Back when I first started my data hoarding journey I only had a single harddrive and my old computer. Important stuff was already saved to the cloud so all I did was download it onto the drive. I still primarily save anything important in the cloud first but it’s all synced with my server too.

I not only follow it, I exceed it for the important things like my tax records, pictures and serial numbers of my valuables, etc.

• Live copy on my Linux box
• Automatic cloud backup onto Google Drive
• Manual sync onto Onedrive via rclone
• Raspberry Pi on my network with external hard drives attached to it, manually updated via rsync
• Hard drives I keep in a safe deposit box at a local bank. These are updated a couple of times a year
• Encrypted archives I keep on my phone and iPad. These are also updated a couple of times a year

Basically, the only way I'm losing all those files is if nuclear war breaks out. If that happens, I'm going to have more pressing issues to worry about than my files being safe.

what's the 3-2-1 rule?

well I have encrypted off site copies at my partners house in London and my other partners parents house across the state. just be poly!

as far as the two goes, I have copies on physical spinning platters and copies of critical data on ssds.

as far as the one is concerned, I have separation of copies from the Washington coast to London so it would have to be a world ending disaster to cause me to lose all copies of my data.

that being said it has taken me the better part of a decade to get this far and they are all cold copies so they require maintenance to keep up to date. that being said they can't be infected from the internet very easily that way