Copy-on-write

• 1. 写入时复制: copy-on-write
• 2. 写入时复制代理: Copy-On-Write Proxy

• 1.如果文件正在被写入时您复制该文件，会发生备份损坏，从而您具有处于不一致状态的备份。
  Backup corruption happens when you copy a file as it is being written so that you have a backup that is in an inconsistent state.
  dict.yoduao.com

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