Comodo Time Machine (CTM) is a powerful system rollback utility that allows users to quickly restore their computers to an earlier point in time. CTM ‘snapshots’ are a complete record of your entire system (including the registry, critical operating system files and user created documents).
http://www.comodo.com/home/data-storage-encryption/data-recovery.php

www.mspot.com
1) Configure both pop accounts with “leave a copy for 14-30 days”
2) Set different outlook signature on two machines
3) Set rules on both machines
- For all outgoing email, send a email to your email account
- For all incoming email from your email account and with certain unique keywords (in signature) from machine#1 in the body, will be forward to sent item folder
- For all incoming email from your email account and with certain unique keywords (in signature) from machine#2 (own machine) in the body, will be deleted