There are many companies doing online backup. There is Carbonite, SOS, Backblaze, SpiderOak, and numerous others. I’ve used a few of them all they all pretty much work as expected and they almost always cost about the same. Most of these products restrict you to backing up internal drives only on one computer. May of them only work on Windows.
IDrive is a different kind of product. You can backup all of your devices as long as it does not excide the amount of storage in you plan. Plans start at 5TB for $52.12 the first year. BUT WAIT! I have an offer for you.