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.

Safe deposit box at a local bank.