I’ve clicked the “Sync” button on a desktop machine, and it is very very slowly uploading everything to the remote Sync servers. Which is great! I’ve been waiting for it.
The only thing wrong is that it says “Downloading…” in the dialog box with the progress bar. If it is downloading (from an old partial copy of my data from several years ago on the GS sync server) that would be very bad.
I am pretty sure this is just a UI bug: It should say “Uploading” when it’s doing that, and “Downloading” when my local data is in danger.