Ovirt Hosted-Engine Deleted

Question

Dear lovely stackoverflow community,

Yesterday I accidentally deleted my ovirt-engine-domain.

--> surprisingly the whole folder is gone, and its not restoreable

Of course my VMs are still running, but I don't have any backup of my self-hosted-engine. :(

I have decided to install a new engine this weekend. I would appreciate any recommendations.

My Plan: reinstall everything :(

Im Using CentOS 7.3 and was using Ovirt 4.1

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Is there a possibility to re-install a new Hosted-Engine without a fresh OS?

Is there a possibility to clean a Ovirt-Node so I can use it in another Engine-environment?

Does anybody have any experiences with this:

https://access.redhat.com/documentation/en-us/red_hat_virtualization/4.1/html/self-hosted_engine_guide/cleaning_up_a_failed_self-hosted_engine_deployment

ovirt-hosted-engine-cleanup?

ovirt-hosted-engine-deploy answerfile?

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