Backups themselves are stored in D:\folders. You can transfer that folder to the new install and have your backups intact. You will also need to edit the registry to recognize the data.
Do you need to transfer any shares as well? If you need to transfer them, go to D:\shares and copy that folder to the new location. Because you did this, you can skip the section labeled in the following tutorial.
Here's a guide on transferring the backups. Since nothing is corrupted, you just need to substitute the word 'copy' for the word 'recover'.
http://wiki.wegotserved.com/index.php?title=Migrate_Shares_and_Backups_to_New_System Good luck transferring everything!