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I guess the obvious answer is a Pi with a USB drive. There are plenty of other options out there but the one I'm using is about 10 years old so I'm a bit out of date.
So long as you can mount it and it's reasonably quick it shouldn't be an issue.
The backup script that I use creates a disk image that you just write to an SD card if you need it.
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(Huge knowledge gap alert claxon)
Where is it best to learn more about these? Is there an equivalent of what gsmarena offers for mobile phones? Seems to me it's the kind of subject Google can provide billions of answers around.
It sounds like it'd be best to backup locally on a drive then backup the backup too?
Network Drive is an option which would suit other needs too... any recommends?
Re: sd it's a backup of the configuration that matters most & ability to plug in a fresh sd card to get going again quickly. Each pi (5 now) has a different set-up for it's purpose so it'd be good to have that on sd ready as that side is unlikely to change along moving forwards. Only one of these pi's is for storing files long term, the 400, so that has a little SanDisk usb drive plugged in at present which isn't long term good idea either I guess.