For me it is - 2x local connected backups, two identical copies usually, one on an internal HD separate partition, one on a home NAS. Usually once a month or s

For me it is - 2x local connected backups, two identical copies usually, one on an internal HD separate partition, one on a home NAS. Usually once a month or so, more often if I am doing something specific - 3x rotating external backups in a bank safety deposit box, every 3-4 months or so will rotate one of the backup sets there all disks are encrypted of course. I am surprised a lot of people pay per month to backup online when a safety deposit box is usually way cheaper, and you can't beat the transfer speed. A standard bank safety deposit box seems to fit 3 3.5" hdd perfectly, or 6-7 2.5" hdds, and that's a lot of TB for not a lot of money. I always rsync --checksum a second time after backing up, and am starting to think about writing a py script or something to calculate checksums and save them on the disks so I can check them at any time, but this said with the implicit redundancy above of having 2x nearline + 3x offsite it should be fine I would think.