How to Backup? Basic Newbie Help Needed

I’m very new to self-hosting and yunohost, so apologies for a basic question.

I want to automatically make backups of my entire yunohost server (not just the yunohost parts, all of yunohost plus the debian base) into an S3 bucket. Is that the same as backing up the root (/) directory? Is this considered a “snapshot image” of my entire SSD drive? If my SSD drive fails, I want to be able to buy a new SSD and install the ‘snapshot image’ onto it so that everything is exactly the same as before the SSD failure.

Do any of the available yunohost apps like Borg or restic allow this to occur? I’ve been trying to follow the tutorials and posts, but they seem to only involve backing up the yunohost parts, not the debian parts.

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