Encrypted backup to two cloud services (eg, AWS Gacier) is the best option in my view. Copy the backup software binary (that will run on any X86 hardware). Test

Encrypted backup to two cloud services (eg, AWS Gacier) is the best option in my view. Copy the backup software binary (that will run on any X86 hardware). Test every year. The encryption password must be written down and stored. Archival at home is time consuming and expensive. If you absolutely must, consider hot storage, say, a ZFS array with ECC RAM, that runs periodic scrubs. You have to attend to the storage system, and migrate the pool every 5-10 years to new technology. It’s a pain, frankly.