Hi there and thanks for the compliment! We haven't heard of this, and we just tested it here with a fresh Spiceworks Inventory install without any issues. I can tell you this error means that when Slitheris tried loading your Spiceworks DB backup, it thought there were no devices in it or there was some other issue. But I'm sure you have or you wouldn't want to try this feature.
It would help a lot if we could see a copy of your Spiceworks (Spiceworks_prod.db) database. If that's ok with you, please Zip and send it to our support email. All data sent to us is kept strictly confidential and is only used for purposes of fixing this apparent problem.
Once we get this issue taken care of, we'd love for you to mention us and this feature in the Spiceworks forums. We've rarely been getting mentioned there lately and it helps a lot.