Yeah there are always sharp edges on backup processes. For example I'd been taking faithful backups of Hyper-V virtual machines, but apparently there's a privat

Yeah there are always sharp edges on backup processes. For example I'd been taking faithful backups of Hyper-V virtual machines, but apparently there's a private key that is stored elsewhere (and thus wasn't backed up), but without which you can't restore the software TPMs (~required since Windows 11). There are so many of these that the only way to really know is to test. Thankfully that is becoming so much easier with all the declarative infrastructure, Docker/containerization, and virtualization tools these days. Spin up a second copy of your infrastructure once in a while and try a restore.