Update:
With the native Manjaro installer I succeeded in making my disk encrypted. But it’s below the btrfs layer (btrfs sits inside the encryption)
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btrfs does not have native encryption built-in.
Instead, one way you can encrypt the disk is to first set up LUKS partition(s), and then have btrfs as the filesystem once the partitions are decrypted.
You can also apply luks to an existing partition
Not easily. Doing it after the fact is hairy at best.
