VirtualBox is an open-source computer hypervisor software package maintained by Oracle. VirtualBox is capable of running on multiple platforms and handling different kinds of virtual disk formats, ...

Are you talking about doing this within the VM or from the hypervisor layer? If doing this from the hypervisor you will still be backing up the whole VM file, so I don't see this buying you anything.

After reading my article "Backing Up Live Virtual Server VMs," a couple of administrators asked me if it was possible to back up individual files or folders inside a running Virtual Server 2005 R2 SP1 ...

A virtual machine (VM) snapshot can be a boon when it comes to recovering from a sudden system or VM failure. A virtual machine’s snapshot preserves the state of a VM and all its data. When data is ...