Going to attempt another server migration again tonight 11PM EDT
As far as I can tell the bugs have been ironed out and it should go through ok this time. The routine is as follows:
-APUG locked for full backup (40mins)
-Site re-opened but in a locked state (this allows me to give you status updates during the migration)
-File copy to new server (2hrs)
-Site import to new server (30mins)
-DNS Updated and APUG re-opened
Total down time estimate 3.5hrs or less.