When making a backup of your virtual machine images, you need to make sure that the data in the VM disk image isn't changing while you are doing the backup. Otherwise you might end up with a useless corrupted backup image.
First of all make sure you have the qemu guest agent qemu-ga installed in...

I have been running my own mail server for years on my home broadband connection. Most of the time it has been running fine, and when the connection does go down it hasn’t been for long enough to cause any email problems. But what if I my mail server did lose its internet connection for a couple of...