Linux · btrfs

How does openSUSE's default btrfs setup let you roll back the system after a bad admin change without also reverting your personal files?

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When you modify a file on btrfs, what happens to the original disk blocks holding that data?

A colleague assumes btrfs is the universally adopted next-gen Linux filesystem. Where does the vendor picture actually diverge?

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In btrfs terms, what is a subvolume, and how is it different from just making a directory?

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