I'm evaluating SyncDocs for both file/docs synchronization and generic realtime backup.
As far as I can detect, there's no way to specify that some folders are only to be backed up, not synchronized. This gets a bit messy when several PCs are using SyncDocs with the same account, as a new installation defaults to syncing everything. I need to quickly stop synchronization, disable the backup folders from other PCs, then delete everything that was synchronized locally.
It would be nice to somehow flag certain folders as "private" to a single PC, and that transfers should default to upload only. These settings should be respected by other PCs - I guess this would require some shared state between installations, possibly in a special GDocs file... ?