Dear Brain,

Thanx to reply..

I am explaining suppose..I have started it at today 9-12-09.Now I have the backup of up to 23-12-09.

Now on 24-12-09 automatically the backup of 9-12-09 will be deleted.but from 10 to 24 I have backup.

Now on 25-12-09 automatically the backup of 10-12-09 will be deleted.but from 11 to 25 I have backup.

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Now on 25-12-10 automatically the backup of 10-12-10 will be deleted.but from 11 to 25 I have backup.