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Let's not assume that a backing file is going to be the result from a snapshot for each memory region. These regions might be backed by a file on the host filesystem (not a temporary file in host RAM), which means they don't need to be copied and stored into dedicated files. That's why this commit prepares for further changes by introducing an optional PathBuf associated with the snapshot of each memory region. Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>