B & R 16 After windows crash my previous backups are missing in B & R program

After a Windows 10 crash I lost my C:/ Data which was backed up by B & R 16.

Backup was to a NAS and the backups are still physically on the NAS but I have obviously lost the file that contains the backup links, which must have been on the C:/. I've made the registry fix to access the NAS, so that's fine.

How can I reindex the backups again so as I can use the backups to recover my C:/ data?
My main data is on D:/ and it would be nice if I could have access to those backups also incase they are needed.

The main file I needed that was on C:/ is my emails which is about 3Gb.

Can anyone help please.