Backups. Tape is still the cheapest and most resilient option for long term storage. Considering how expensive hard drives are now, changing your backup strategy to use tape instead could save hundreds of millions vs buying the equivalent amount in hard drive storage. Add the AI cybersecurity threats, plus the likelihood of regional turmoil and data centers being targeted in warfare, and how valuable pre-AI data is, I imagine there’s a desire to replicate existing backups for redundancy, and keep more of it in air-gapped cold storage.