mix wrote:when I define a Backup Job to use storage snapshot as backup mode, do all VM disks have to be on a storage that's capable of using storage snapshots or can I have a mixed configuration where the VM has also disks from a non storage snapshot storage?
All VM disks have to be on the storage snapshot. In the mixed scenario, backup job will failover to other processing modes. Please take a look at this page for more info > Backup from Primary Storage Arrays
mix wrote:Does Veeam back up the sorage snapshot disks with storage snapshot and the other with for example hotadd or does it simply switch to hotadd or another transport mode (whatever is configured)?
If storage snapshot mode is not available, backup job will try other modes one by one.