I use bormatic, I can go back about 60 days and have needed to a few times in the past due to my own mistakes. Server is in the basement, it backs up toy living room TV pc which is on the top floor. My upload speed is too slow for offsite backups.
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Zero or one backups depending on the type of data generally.
For a system if it can't be redeployed from a list of requirements then I Foundationally ducked up. It means either I'm depending on something fragile, unknowable or over complicated.
Raw data on the other hand goes on a raid array. If I need more redundancy then that, then a single extra off site backup on a cd or something.
A back up on the same drive as the original isn't a backup. It's a waste of space, and a stupid idea.
A system that requires excessive nonsense is not reliable.
If I have a on and off site back up and both fail. Then either the world is literally fucking on fire and it doesn't matter. Or someone dropped a bomb on my storage.
Either way I have bigger problems at that point.