3 copies of your data
2 storage mediums
1 offsite
Easy to understand and so far I'm doing 2-1-0 (Not including 2TB on Dropbox), and my second NAS arrived and my hard drives come next week, so once everything's copied to it and I take it to my brother's place I'll be at 3-1-1.
Just not sure how to get to 2 mediums, and seems like most the people quoting the 3-2-1 method don't actually do the 2 mediums themselves or they're willing to pay for cloud storage.
I know it means using tape or optical discs (DVDs, Blu-rays) but what are some other methods? Do SSDs count? Curious how people here are managing the 2nd medium? Maybe I could buy a shipping container of floppy disks.