There is likely no single good answer. Personally I break the issue into the long and short term. Long term (100s 1000s of years) the answer seems somewhat obvi

There is likely no single good answer. Personally I break the issue into the long and short term. Long term (100s 1000s of years) the answer seems somewhat obvious. Preservation of information can be useful to future generations. Short term our societies are experiencing rapid change. Many things are built and soon discarded based on factors other than utility. So preserving the knowledge is useful for the minority of people that found those things useful. Also there is intentional mass truth distortion amplified by technology occurring. Preservation of the original sources of information is the first line of defense against it.