I have found a software called Sandiebox ( http://www.sandboxie.com/
) which seems to do the trick. It can run any windows program in a sandbox (even for testing cryptolocker virus..!) and it allows me to run multiple Veeam One Clients.
Would be great though if there was a registry thing we could change natively so Veeam One Client would run natively in multiple sessions.
Next up: Finding a software that allows me to schedule rotate the view of the Veeam One Clients