There is a tutorial on backing up to Amazon S3 but it hits an addons page instead on the confguration page. So I would say these videos are out of date since they are linking to paid addons.
I simply take a snapshot on my cloud hosting. Cost 20% of the hosting for peace of mind on all sites.
Got it, I use OVH, and as far as I know the Snapshots are in the same physical datacenter, and they have a frightening history of fire that destroyed the strasbourg datacenter.
I would prefer something more personalized, AMAZON S3 would be nice too!
You could sign up for a free OCI (Oracle Cloud Infrastructure) account.
You can certainly back up Cyberpanel on the free tier plus a lot more. Cloud Free Tier | Oracle