RHEV VM backup solutions

Hello!

I'm interesting in Red Hat Enterprise Virtualization, and I need information how I can backup my created virtual machines without losing of supervision and stopping my business services. For example, I going to update the software on VM and I need to backup my data to prevent it’s losing in case of update failures. But I can’t find solutions for these cases.

I see that there are snapshots available for backing up VM’s state. But it is needed to power off the VM to take the snapshot and it can take a lot of time.

May be, it is possible to clone my VM and perform some changes on it after that? And I can to power on the clone instead of original machine in case of software failures on it?