I do the same as you on my backup PC, which does not have all the RealTracks, only the ones I know I need. I do have all the RealDrums, though, since they take up much less room.

PG Music does update older RealTracks on occasion via patches, so I always set my file copying to consider everything. It will only overwrite the files that are older than the source, and this takes the software but a moment to evaluate.

Very simply, I go into my RealTracks folder and sort by Date. Anything new will appear at the top. I select the ones I want and begin copying. Within each folder, any files not newer than the target files will be skipped.

Another way to say this is that the file dates on the audiophile drive are NOT all December 2021; older files will still have their older date, so copying only the newer material is easy.

Is this on the right track of answering what you are asking?

BIAB 2025 Win Audiophile. Software: Studio One 7 Pro, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus 192 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.