例如，您可能希望每天做一次联机增量备份，然后每周在维护期间执行脱机完整备份。
For example, you might want to do an online incremental backup once per day, and then do an offline full backup once per week during a maintenance window.
必须有人每周浪费5个小时来做这项工作，维护它。
Somebody has to waste five hours a week doing this and maintaining it.
他们必须保证服务24x7可用，即使在每周的维护窗口运行的时候也一样。
They need to guarantee service availability 24x7, even during weekly maintenance windows.
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