Backing up the PVE node - dd, LVM snapshot, or better option?

I need to install some software on my PVE node because I cannot use dual GPUs via PCIe passthrough on my VMs.
In case this messed something up how can I backup the root node (just a debian machine, right?) so I can restore it if I mess something up.

I was first thinking of doing dd on the whole drive to an external drive, but that's a lot of data and it would backup the VMs too which I already have backed up with PBS.

Can I take a LVM snapshot of the root node, install my software, and...

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