What are you non-obvious, maybe strange usecases of Syncthing?
For example syncing the media library with your friend or maybe your entire /home/user folder between your PC and laptop?
I’d love to hear your ideas!
I’m currently building the same setup, the long-term goal being a Crashplan-type solution (back when they had a feature where you could backup to your friend’s devices).
Having a large family, there a many geographically distributed locations for us all to use.
As for OwnCloud, ST is far simpler to setup. Granted, it’s not nearly as flexible. I do use it to keep all our laptops and phones “backed up” to a desktop that runs Crashplan and Backblaze.
Edit: With ST that VPN isn’t even required. It will sync, encrypted, over most any connection.