incremental backuping

I am new to this forum and I want say Virtualmin Rulezzz - only one wish for this time - can you please implement incremental backuping system ? I wish I’ll have many users on my system and I wisth to backup their emails (I love my users so much ;o) but I don’t want to implement it my way through using rdiff backup on users maildirs so this would be great. Incremental backuping for chosen folders under virtual server.