Summary: Add a simple example of backup and restore Signed-off-by: YiteGu <ess_gyt@qq.com> Pull Request resolved: https://github.com/facebook/rocksdb/pull/10054 Reviewed By: jay-zhuang Differential Revision: D36678141 Pulled By: ajkr fbshipit-source-id: 43545356baddb4c2c76c62cd63d7a3238d1f8a00