I occasionally wonder how many enormous collections of culture like that of Marion Stokes[1] have been lost because their curators made no effort to realize the value of their collection.
The good news is I'd guess the number of (nonreligious/nonproprietary) institutionally managed pointless archives is dwindling.
One may collect/archive now (when the data is, well, "available"), and publish later, when copyright expires and the material will likely be harder to obtain.