备份 bèifèn backup
How to remember 备份: 备 prepare + 份 measure word for portions and documents = backup.
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How it is used
- A backup / to back up (data) - 数据备份 (shùjù bèifèn) data backup; 备份文件 (bèifèn wénjiàn) back up files.
- A computing term for a saved copy; distinct from 后备 (hòubèi, reserve resources). Neutral/technical.