Mail Network Backup enables incremental backup for both network and local data.
Despite these issues, Mail Network Backup offers a reliable backup solution for your email scripts that you won't want to miss. However, it's worth noting that there may be problems with the default build if you do not have Entourage installed, although I have yet to verify this.
If you're looking to use Mail Network Backup, you'll need XCode to edit and compile the software. Overall, this is a great app that offers fantastic backup capabilities, as long as you're willing to work through some potential issues along the way.
Version 0.1: N/A