You seem to be serious about this, but rather vague on the details, so I wanted to reply, just in case. If you don't already know about ZFS, please look into it

You seem to be serious about this, but rather vague on the details, so I wanted to reply, just in case. If you don't already know about ZFS, please look into it. A properly provisioned server with ECC RAM and a ZFS RAID6 will provide the best possible defense for your archive in the years (or decades?) to come. Current filesystems don't come close. If this is all new to you, look at FreeNAS for a "turnkey" solution. As well as being a solid piece of software, their guides can help you configure the necessary hardware.