Hi GilaMonster,

Can you please give some references more information on how differential backup size increases because of Index Rebuilding process?

I am not able to find any information on this.

I got one more thread

http://social.msdn.microsoft.com/Forums/en/sqldisasterrecovery/thread/33a6e516-c7f7-4acd-a95c-7a1a84e41ff8

This also mentioning about index rebuilt and databas shrinking as one of the reason for large size of differential backups.