Honest questions, if you don&#x27;t mind:<p>- What types of systems are these?<p>- When you say &quot;40 year history&quot;, do you mean the system was originally written in the 70&#x27;s, or do you mean it has data going back to then?<p>- Why do you need to keep data for 30 years? Regulatory reasons? Reporting? Or just long-lived data?<p>I&#x27;m not doubting anything you&#x27;re saying. It&#x27;s easy to imagine systems with those attributes, say, in banking, insurance, legal records, etc. I&#x27;m just curious about your specific case. :)<p>Long after the logic of your system has been replaced, the data will live on. It&#x27;s something I think people tend to undervalue.