I recently abandoned Carbonite for any photography work as it can cannot keep up with the large files that DNG and TIF files generate. I have a copy of my Lr Lrcat on a second disk and I do a incremental system backup to an external hard drive weekly. Still, I like the idea of having an forth copy of the Lrcat in the cloud.
I had heard about Duplicati and tried it a little. With the dismissal of Carbonite I decided to look at Duplicati again. I set up my backup plan and let Duplicati backup the Lrcat folder to my Skydrive account. This was very easy and only took ten minutes or so. The folder on Skydrive does not look like the two Lrcat files I uploaded; it is a series of about 20 Duplicati files. The total of the Duplicati files was 353MB; the two Lrcat files that it backed up were 1.2Gb each. That's impressive compression. (I'll have to try it on some DNG file an see how it does.)
This morning, I restored the Duplicati files to new folder on my system. Restoration took about five minutes. I tested the resulting Lrcat file by opening Lr and changing the catalog location to the restore folder and restarting Lr. Works perfectly!
This is a good tool and I will give some consideration as to how I can use it in other effective ways.
I backed up 2.97GB of RAW (RW2) files with Duplicati and the resulting files on Skydrive are 705MB. That's about a 4:1 compression.