RPO - the time between last backup and disaster. Basically how much data are you happy to loose.
RTO would be time between disaster and recovery. Basically how much time are you happy to be offline.
youtube-dl --extract-audio --audio-format mp3 URL
https://explainshell.com/
https://opensource.com/article/18/4/linux-filesystem-forensics
https://opensource.com/sites/default/files/gated-content/cheat_sheet_ssh_v03.pdf
https://opensource.com/article/18/1/top-11-vi-tips-and-tricks
https://opensource.com/article/18/1/step-step-guide-git
https://opensource.com/article/18/4/reset-lost-root-password
https://opensource.com/alternatives/autocad
https://opensource.com/article/17/11/openstack-basics
https://opensource.com/article/18/5/getting-started-regular-expressions