Transfering via network is only secure, if you believe that forward security exists for network traffic, which is very likely untrue.

The point being: if your encrypted network traffic is captured and retained, maybe it can still be brute forced at liesure, and deduplicated for deltas only. Thus, volume is only a temporary issue, and everyone still gets to see everything eventually, and full retrospective records are still enriched, so maybe that's fine for some things, and not for others.