Bradley Nelson

The reasoning is that your backup server should be more secure than production. Production has to have a bunch of stuff open in order to be useful and convenient. The backup server does not. It can be basically fully locked down.

The term 0-day vulnerability in security has a specific meaning. It means that it was not found by security researchers and is instead being actively exploited on the day that it’s discovered. I’m pretty sure none of these by definition or zero days

Sorry I can’t help with the proxmox stuff but it is absolutely fine to have a qcow2 image on an SSD pool. Modern SSD write endurance is so high as to be a non issue especially in the relatively tiny work loads that HA will put on it