Redhat bad blocks

Hello,
We had a wierd problem with redhat this weekend. The server stopped responding. On reboot fsck said there were bad blocks. I forced mounted the drives and everythign was ok I ran esfsck and marked the blocks. My problem is should I be worried about this???
I can sedn the drive back to Western Digital but is there a way copy an entire drive over to a new drive if so please let me know how as I am not sure.
This is a production server and can't afford downtime or loss of data.

 

 

 

 

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