What is the difference between a full and a differential backup?
Full backup gets all the data and pages. Differential backup only gets the pages that have changed since previous full backup. Ultra-simplified explanation. To get more in-depth information on all things backups check out Paul Randal's blog:
http://www.sqlskills.com/BLOGS/PAUL/category/BackupRestore.aspx - Link to his backup/restore articles
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