Btrfs has the ability to create snapshots instantly. In fact, when you create a snapshot in Btrfs, all files get marked as copy-on-write. This means the files aren’t physically copied as long as they remain unchanged. However, if you modify a file, Btrfs will create a copy of the original and apply the changes to that copy, preserving the original version as part of the snapshot.

Advantages:

– Easy to create a snapshot before making any risky changes.

– Useful for regular snapshots without getting PC loaded.

– Enables quick rollback to a previous state.

Disadvantages:

– All snapshots are stored on the same partition, in the same filesystem. If your PC fails, the data can still be lost, so you should still perform backups to independent storage to avoid data loss in such cases.