A couple of questions.
* Is there an iOS app on agenda?
* Can I choose something like S3 or even Dropbox (yes!) to be a central server (more precisely a peer)?
* Is there an iOS app on agenda?
* Can I choose something like S3 or even Dropbox (yes!) to be a central server (more precisely a peer)?
* S3 and Dropbox are not officially supported,[3] but you can always sync one of your Syncthing nodes to cloud storage on your own.[4]
[1] https://github.com/syncthing/syncthing/issues/102
[2] https://www.mobiussync.com
[3] https://forum.syncthing.net/t/how-to-sync-files-with-aws-s3-...
Synchting supports end to end encryption. So you can use cloud storage with encrypted folder, for connectivity (no need for relays NAT traversal etc). Clients sync through an always-on peer.