I was storing all my photo on a NAS which failed. The hard drive was fine so I have recovered the photographs and copied them on to a new NAS. While PG can rebuild the database based on the information stored in the metadata there are still bits that were only stored in the database. I have 13,000 photos so don't want to lose all this info I added to them.

How can 'tell' the old database where the new files are located? 

thanks in advance.

Matthew