The 3-2-1 Backup Rule – Why Your Data Will Always Survive (2019)
People often forget the 3-2-1 rule should also apply to the secrets you use to encrypt/store your backups. If you can't decrypt it, it isn't a backup.I use a crazy long passphrase to encrypt my backups, but should I forget - it is also printed on archival paper inside a sealed envelope in a friends safe deposit box (I also have a copy of his backup passphrase for mutually assured destruction :)).Also, every once in a while run a fire drill and actually restore something from each of your backups. This is when you find out the rsync job has been stuck for the last 80 days.