

No, it isn’t part of the EU.
It is part of the Kingdom of Denmark, which isn’t in the EU. Only Denmark, a country within the Kingdom is in the EU.
However, the citizen of Greenland are citizen of Denmark, thus EU citizen.
But you are right that Greenland has a closer relationship with the EU, then Ukraine. And the EU and allies want to protect its citizens at least. And via its member state Denmark, the constituents of Kingdom of Denmark as well.
Edit: To be honest, I have no clue what happens to citizen of Greenland, if US would take over… Would they be EU and US citizen? Would they have to leave? Well… Let’s hope that doesn’t get answered anytime.





Btrfs is a filesystem just like ext4, you can mount the root subvolume and upload all files somewhere.
Timeshift is not a backup solution though. Snapshots are built-in with btrfs. So you can install a snapshotter tool like Snapper. But it would be best if you already have partitioned you btrfs filesystem into multiple subvolumes. Like the suggested layout.