Another reply and I will start my KVM Backup software project.
But let go us back a step to reality, do we really want Backup component with KVM with enterprise features ?
How about nice web GUI for saltstack, without dealing with terminal all the time.
Why we are IT pros then if we want everything easy, whats the point if we can just pour alot of money for product and do a couple of clicks and make things easier for us but eventually the company will suffer each year with this route.
We are IT pros cause we continuously learn and adapt and KVM currently is very good in being just a hypervisor , extra features like backing up VMs are work in progress (I assume) but you can either take the jump or keep it in your LAB testing and check it every once and while for latest updates.
What will happen when we keep attaching enterprise software with foss software ? either the enterprise company will release it as free version with limitations or the foss software (KVM) will stop being foss.
I dont think any company will make good backup addon/component for KVM cause it is free and the users using it are FOSS folks, and we like it that way and there are little people that will pay for it, you are kinda of expected that since you went the KVM route that you know your stuff and you will create your own backup strategy, I am sure amazon and google compute engine have created this already then shifted to KVM, so it can be done.
Let us pay respect of how easy it become and stable KVM is, especially considering how it was. Now with cockpit and virt-manager it is piece of cake for me, much easier that Hyper-V IMO, back in the days just installing KVM was difficult, and you needed to use freikn command line and text editor to create VM.
So lets just wait for FOSS solutions, I am sure in the next years we will see more cockpit options for KVM, but for now KVM rocks (especially for SMB) and beats anything out of the water (mdadm support) without any limitations. sadly it is the word of mouth that harms it, people that want very limited free ESXi or hyper-V package that relies on multiple other 3rd party solutions to make it acceptable.