How to roll back a btrfs snapshot and restore corrupt or missing files - TechRepublic: "The btrfs (often called Butter FS) is a modern copy on write filesystem that offers some seriously handy features and focuses on fault tolerance and repair. The developers of btrfs have also gone to great lengths to make it easy to use. No other aspect of btrfs highlights all of this more than the ability to take snapshots of a subvolume and roll back to a previous working state.
I'll show how easy it is to do just that on an external flash drive (for the sake of simplicity). You might want to test this process on a similar device before you're ready to take this to a production machine."
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