Updated 2026
Three copies, two media, one offsite. The offsite copy is the one that saves you when the building, the disk and the snapshot all go away at once. Test a restore quarterly; an untested backup is a hope, not a backup.
Updated 2026
Keep TTLs short before a migration and long afterwards. Delete records for hosts that no longer exist. Use one authoritative provider and document every record in a text file that lives next to the infrastructure code.
Updated 2026
alias ll='ls -lah'
alias gs='git status -sb'
alias ports='ss -ltnp'
alias week='date +%V'