I just started using Carbonite to backup my photography database. I have it set to backup two folders: 1. My folder tree that has all my RAW/JPG/XMP files 2. My "Lightroom" folder which nests in my "Pictures" folder Obviously #1 is critical. However I noticed that in my Lightroom folder, aside from my actually the Lightroom previews file - it's 3GB! Is there any reason why I would need to back this up? Surely in the case I would (hopefully never) have to restore my photo database, couldn't LR just generate new previews? I'd like to conserve backup space where I can, so any input would be appreciated.