I'd recommend the hybrid approach with NAS and Tape Drive

Build a robust NAS system for remote accessibility, but consider setting up a hierarchical storage management (HSM) system. Frequently accessed or recent projects can reside on the NAS, while older and less accessed ones can be automatically moved to more cost-effective storage.

Invest in LTO-9 tape drives for archival purposes. While the upfront cost is more but tapes provide long-term, cost-effective storage. This is particularly useful for archival data that doesn't require frequent access. It adds an extra layer of redundancy and security.