>It can be helpful to remember that while less efficient, for scenarios where ssh as root is a no-go you can ship snapshot syncs (including incremental ones) as files:

This capability can also be extremely helpful for bootstrapping a big pool sync from a site with mediocre WAN (very common in many places, particularly when it comes to upload vs download). Plenty of individuals or orgs may be characterized by having quite a sizable amount of data accumulated by this point, but they're not generating new data at a prodigious clip. So if you can get the initial replication done, ongoing syncing from there can be possible over a fairly narrow pipe.

Latency might not be quite the best, but sometimes the greatest bandwidth to be had is a big fat drive or set of them in the trunk of a car :)