Just get an external drive that you can dump everything important to imo, or maybe use dropbox if what you need to backup is within its size limits. It's been a few years, but when I checked into online backup services, they were basically all scams. If you tried to use them as an actual back up, you'd end up being throttled to crazy low speeds or have huge extra charges. There may be better ones now, but definitely read the fineprint.