Interesting question to be sure but as far as I understand computers (which isn’t much I’ll admit) one doesn’t need to be in the same physical location as an email server to use that server for emails. So she could have been keeping it up in NY just as an added layer of “security” (for herself, to keep it further away from any prying eyes).
It is obvious to me now what was going on. Hillary never saw any classified warnings in her email. She instructed Abedin to delete any classified warnings before she emailed them to Hillary. Bingo. Hillary never saw any classified info in her emails. Typical Clinton scam. Abedin is the other half of this scam.