Discussion
In SQL Server 2000, which of the following makes a copy of the changes that have been made to the database since the last complete backup?
Answer: C
Correct answer: Differential backup
A differential backup copies everything that has changed since the last full backup, so restoring needs the full backup and the most recent differential only. It is quicker than a full backup and simpler to restore than a long chain of transaction log backups, at the price of growing steadily until the next full backup resets it.
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