As far as I can see (they don't tell much on their site) they make a backup of some cloud-based mail servers (hotmail, gmail) into their own (Amazon-based) cloud. So they don't make a backup of the mail on your hard disk. Since you don't tell where your office mail is located, it's unsure if this would be something for you.
Which email backup solution are you guys using?
I want to backup all my Yahoo and office emails.
I googled and found Dropmyemail email backup solution. Is anyone using it? Any feedback on the service?