Definition
- C2
to demonstrate that something is accurate
证明；验证
His report provided evidence to back up his claims, perfectly demonstrating his point.
他的报告提供了证据来支持他的主张，完美地证明了他的观点。
Scientists use experimental data to back up their hypotheses.
科学家们使用实验数据来支持他们的假设。
The content of this letter can back up your statements, so please keep it safe.
这封信的内容可以支持你的陈述，所以请妥善保管。
- B2
to create a duplicate copy of data
备份（资料）
I back up my files every week to ensure the data is safe.
我每周备份我的文件以确保数据安全。
Make sure to back up all your data before this update to prevent loss.
在更新前请确保备份所有数据以防止丢失。
To prevent data corruption, we should back up the system regularly.
为防止数据损坏，我们应该定期备份系统。