Agreed, backup is slow (although recent versions are leveraging multi-core CPUs, so that's given a modest speed-up). Syncthing in send-only is not a sufficient

Agreed, backup is slow (although recent versions are leveraging multi-core CPUs, so that's given a modest speed-up). Syncthing in send-only is not a sufficient back-up strategy for 90% of use-cases, however. Without incremental back-ups, you're still susceptible to ransomware and data-loss should syncthing update after the event. I do, however, like to keep a "verbatim" copy in addition to my incrementals since they are less likely to have a "restoration" problem.