This would be awesome to run iCloud sync on my homeserver. Currently, there is no good way to physically backup iCloud on a homeserver/nas, because it only runs on windows/apple.
How would this help with that? What would this let you do that's different than just rsync'ing your iCloud folder from a connected Mac/PC to your NAS?
I also can't imagine there is much demand for IMAP only email migration services these days.