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Hi Brendan,

Sorry for the inconvenience caused.

We haven't faced this kind of issues in our environment as well as our customers haven't reported the same before.

Vembu is a VMware technology alliance partner and we are using VMware VADP API to perform Both Backup and Restore operations which is recommended by VMware. We suspect the particular issue may be environment specific. Please be informed that there are various scenarios for ESX(i) host's reboot. The common causes for the ESX(i) host's reboot are,

  1. ESX(i) host over committing too much CPU or Memory resources.
  2. Hardware failures
  3. NIC card failures, it should throw a PSOD though.

Please verify the above listed scenarios in your environment and update us your findings. If this is not the case, please let us know, whether this is the only ESXi server misbehaving after backing up by using Vembu VMBackup or any other ESXi servers are facing similar problem. Also, please install VMBackup Client agent in some other physical machine and check whether you are facing the same issue again.

Refer this VMware KB to get the log for the ESXi server crash issue and provide us the log file to analyze this issue further.

Looking forward to hear from you.

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