I use my iPad more and more for email but I'm concerned about billions of emails accumulating and ending up as Gigs of backups. Is there a way to limit the number of emails that are loaded onto iPad, then ideally tap button to load next bunch. For example, I would like to load most recent 100 then tap a button for next 100. Also would like to limit the total amount of email on the device with last in first out. Thanks!