Differential backup — Backs up all of the modified pages in a database after the last successful full backup is completed.
差异化备份——只对上次完全备份之后有过更改的页面进行备份。
A full database backup is required before a differential backup can be performed.
需要执行完整备份后，才能执行差异备份。
A full database backup is required before a differential backup can be performed.
需要执行完整备份后，才能执行差异备份。
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