Hi,
I want to make a snapshot of a directory which resides on a btrfs file system. So I was reading this guide: https://www.linux.com/training-tutorials/how-create-and-manage-btrfs-snapshots-and-rollbacks-linux-part-2/ IIUC it requires that what you want to make a snapshot of must be a subvolume. If that is true, how do I convert a directory into a subvolume without copying the data? Or how do I make a snapshot of a directory?
