Backup your full node folks!
In the (hopefully) unlikely event that a determined actor wipes out all the online nodes we need relatively up-to-date offline backups to restore from.
Look at the SolarWinds [1] attack or the XZ backdoor [2]. If an attacker can compromise enough nodes concurrently they can wipe them and force the whole network into a small surface area.
That doesn’t destroy the network but it would cause a major disruption and could make tor analysis easier among other things. It could perhaps also be used to wipe the last N blocks from the chain tip as part of a larger effort.
The more backups we have to restore from the less downtime the network might have.
1. https://en.wikipedia.org/wiki/2020_United_States_federal_government_data_breach#Background