This one should be really simple to anyone that knows. We had a failure on our exchange (no failover cluster). I had to move it to another box (a vm now thank god). So I brought the users back online in a blank db, and proceeded to mount and restore the old stuff back. However we are still missing the emails from backup to crash. I've since been able to recover the data from the crash time.
Question is now if I run another restore request from the newer data, will it create duplicates. I would think not, but just wanted to be sure. I could always filter with a date time stamp, but would rather just run it full since time is not of the essence and I'd rather get it all back.