I presently backup my Lr catalog to a second hard drive, and the C drive - with the original Lr catalog is - backed up via the web to Carbonite. I'm having a lot of problems with Carbonite as I have too much data being backed up and Carbonite can't keep up. I've been fine tuning the Carbonite account, removing from backup items that really don't need to have backed up there.
The Lr previews file, which is on the C drive is 12.3GB. I'd like to take it off the Carbonite backup list. This file is not backed up on my other drive with the catalog, nor is it backup up to an external backup drive I use for all my images.
In the event I lost the C drive and had to rebuild my Lr data base, assuming the catalog is still available from backup, is it safe to assume that Lr would rebuild the preview files and therefore, it is safe to not have a back of this folder?