Fixed - The backup is complete and the server load has returned to normal. (20:11 UTC — Nov 9)
At this time load on our US IMAP/POP3 server is intermittently very high because we’re running a full backup of the entire server.
We expect this to continue until the backup is complete, possible for another day or longer.
We’ll update this post when the backup is complete and load has returned to normal. (17:57 UTC — Nov 3)