I think LWD has not decided on different tiers. I suppose the standard tier will have some size limitation included. I would prefer in general that the cloud would completely auto-sync (if configured to do so). Wouldn't it be much better if RW - while you entereing topic 2 - topic 1 is synced in the background to the cloud?
Recently bought a NAS and iam very satisfied with the syncing capabilities offered by the backup & file system options. Still not as intelligent as the dropbox sync but it offers versioning and I can see that it quickly syncs down my stuff