“Data storage availability in the 1980s meant that we were not able to keep the multiple sources for some sites, only the station series after adjustment for homogeneity issues. We, therefore, do not hold the original raw data but only the value-added (i.e. quality controlled and homogenized) data.”
I’ve been programming for 50 years. Prior to the availability of cheap disk storage people used tape drives. My first personal computer from the 1980s had no permanent storage other than through an attached cassette drive.