In addition to the recommendations you’re getting already, I recommend learning about Borg Backup. It has great documentation.

https://www.borgbackup.org/

Borgmatic is a project that makes automatic backups easier with Borg.

https://torsion.org/borgmatic/

If you want a GUI for your personal machines there is Vorta.

https://vorta.borgbase.com/

I’ve used Borg for years now and test my restores every year. Which reminds me… I should do that more often. 😅

Bookshop.org also has a DRM-free search filter and shares profits with local bookstores.