Here is a tidbit of information from the Apollo/Skylab days: All down-link data, including voice & video, was recorded at the tracking stations on 1-inch video tape as analog data. Those tapes were post-processed at JPL and Marshall in order to recover the voice, video, and digital data components. (Of course, these signals were used in real time in Mission Control.) There are very few operational 1" video tape machines left on this planet.
I worked for Sperry Rand at Marshall during the Skylab mission. My job related to recovering data from the digital sub-masters that were made from the analog masters. A UNIVAC 1108 was used to post-process the analog masters into digital sub-masters.
We recorded all the Russian dumps of voice, data on common tape recorders. Processed and translated, sent to NSA hourly.