I store my data on a dedicated NAS (Network Attached Storage) box, which uses RAID to ensure data integrity in the event of a HD failure. That's the first level of protection.
Once daily any new or changed files get copied to a standalone HD which is installed in a removable caddy. I have two of them, when I visit my mum I swap them over.
So at any one time my data is sitting on three distinct storage devices, although obviously the data at my mum's place isn't as up-to-date as the data sitting on the NAS.
Another solution for offsite storage if you don't have family or friends nearby is a safe deposit box...
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