Hello, Atta. Actually, all of the questions were already discussed in detail in other existing threads on this forum.
atta wrote:We have 3 Domain Controllers and we want to be able to restore AD on one DC and re-sync it with others after restore. In hyper-v 2008 R2 you have to take bakup within VM (system state) and after that with 3-party tools to be able to continue sync it with rest of DCs. If you didn't do that your sync may not work. How is this working in Veeam. How to protect Domain Controller? How is it with system state?
Please look through this huge topic for details on recovering a DC: Veeam B&R v5 recovery of a domain controller
(nevermind the version in its title). Also the following topics could be helpful:Restoring Windows 2008 Domain ControllersMultiple Domain Controllers - How to Backup?Active Directory and DR Site
atta wrote:Another important server is SQL? How to restore single SQL database
Just a couple of topics regarding SQL Server backup/restore:Veeam Backup & Replication SQL Server - need tutorialSQL Backup Jobs
And you can search for more.
atta wrote:and is it working U-AIR in Hyper-V?
SQL AIR for Hyper-V will be available in Veeam B&R v7
Should any additional questions arise, feel free to ask.