Well it runs offline and it is helpfull and it is open source so all the boxes ticked for me so far.

This is an actual good use of AI. Thank you.

I have a raspberry pi with a cheap 5TB usb drive at my parents house that boots up once a week and pulls a backup. I use rsnapshot to create incremental updates that takes up every little space and is easy to manage. I have the drive accessible with smb should I ever need to pull a copy from there. It’s super slow but that doesn’t matter for an off-site backup and it is super cheap

Edit: I should maybe add for future readers that cheap does not mean cheap quality but cheap relative to the amount af TB you get per dollar. I use a WD shingled drive wich is quality drive but cheap and slow af. But it doesnt matter because the internet connection is the bottleneck anyway.