The information in this article applies to:
SUMMARY
A differential backup only records changes made to the database since the
last full backup was made. While typically much faster than a full database
backup, elapsed time for SQL Server 7.0 differential backup is roughly
proportional to the allocated space in the database. Consequently, a
differential backup on a very large database may take longer than expected,
even if few changes have occurred since the last full database backup.
Additional query words: back up diff
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