We have Windows 2012 r2 clients which are having Hyper-v Virtual machinnes.
We are Taking a Hyper-v level snapshot backup for these machines. While during backup or after the backup our hyper-v machines are restarting. Can anybody please give solution please.
Has it ever worked?
Unplanned system restart has to be investigated on the OS level as suggested by PatS729, might be the system is going to a "Saving State" during the backup? If that is the case, make sure that Guest VM can be " quiesced" for online backup (https://www.veritas.com/support/en_US/article.HOWTO101560) or disable "Enable offline backup for non-VSS VMs" (https://www.veritas.com/support/en_US/article.000068006)
First, you *really* have to get your Hyper-V hosts updated with the lasts Hotfixes.
Without them, don't even consider using host-based backups !!!
Also, upgrade NBU to 7.7.2.