Persistent disk backup in VDI enviroment

In my company we have a VDI enviroment based on view 6.0.1, all virtual desktop are linked clone, with dedicated user assignment and persistent disk for user data folders.

My question is:

How Can I backup persistent disks, or only the data stored inside?

I've tryed with various backup solution like Veeam or Acronis, but no one can backup persistent disk.

There is an alternative? Or in which way we can backup only data stored inside persistent disk?

Thanks

Francesco