I’ve been working some time with Veeam Backup & Replication and I’m very pleased about it.
At last I found some time to upgrade my V5 to V6… it took about 2 minutes 
Hereby the steps for the upgrade :
Notice that Veeam already sees the previous installation. Hit Yes to upgrade.
It’s very straightforward.
Check that the correct paths are displayed.
Check the database and the service account. (How long ago did youo change that password? )
This settings should be fine if you’ve done a default installation. I did.
Et voila! No more excuses for failed back-up’s!
Update : for more information visit http://www.veeam.com/vmware-esx-backup.html (English) of http://www.veeam.com/nl/vmware-esx-backup.html (Dutch)