I have not yet implemented this, but I like the idea so much that I think I will... Lightroom syncing across multiple devices! Lightroom doesn't care if you put your images on a network share, but your catalog must be run from your local machine. I think Sync can be used for a two-pronged approach to keep everything in sync and backed up. 1.) First, move the images onto a local NAS with Sync installed (such as unRAID or using VM's). 2.) Move the catalog to a shared portion of your local hard drive (such as "/Users/Shared" on OS X). 3.) Rebuild the catalot to point to your networked images. At this point, you've successfully disjointed your catalog from your images. Now to start syncing. 1.) Create shares for the catalog on your local machine and sync it out to any other machines you have. Since it's already in the "/Users/Shared" folder, it's already accessible from every account on the local machine except now it's accessible from every account on every machine. 2.) Sync the catalog over to the NAS. Now it's located on every client machine and the NAS. In my environment, that's 4-way redundancy. Since the Lightroom catalog is platform agnostic, this will work in mixed Mac/Windows environments! That's all well and good, but this can be taken to the next level. Even though the catalog is now in multiple places, the images on the NAS still provide a single point of failure. However, we can back up the entire image folder using Sync to a secondary remote NAS or VPS.