Which files do I backup?
The Lightroom catalog is where all the edits, keywords, metadata and adjustments are stored. It is critical that this is backed up regularly in case of computer failure or corruption. In this video you will learn how and where to back up your .lrcat catalog file.
After backing up your catalog next you need to back up your images.
Next you need to back up all the preview files that have been generated on import of your images.
Back up all your plugins.
Presets and Templates