OP said DSLRs, but for video the same thing applies. Downres to something reasonable for sharing, and limit the output-quality transfers to the ones you know you want.
This is how even professionals shooting 50-200GB/day do things-- nobody delivers a HD with every single outtake, but instead they just post a web gallery of the candidates and then deliver the high-res files of the just the final selects.
This is how even professionals shooting 50-200GB/day do things-- nobody delivers a HD with every single outtake, but instead they just post a web gallery of the candidates and then deliver the high-res files of the just the final selects.