If you have that much data you want to save I would save the files to OneDrive and save them to a external drive also. That way you won't have to download 100 GB's of data if you ever decide you don't want to use OneDrive any more. It only cost $1.99 plus tax now. What's to stop MS from increasing the cost dramatically once they get everyone they can hooked into the 100 GB plan.
An external drive is not the best way to recover from a total disaster, fire etc., I need to have my data off site for that. When I worked at several IT shops we had to have detailed plans for disaster recovery and I still follow them as much as I can and using the cloud is great for this.
That is a very good plan in theory. Disaster. Off-site. If disaster can strike anytime. It can strike anywhere. Even off-site.
If there is a total disaster, I won't have time to worry about file recovery. I have to recover my life back first or I may not exist any more to do any recovery at all.
I do backup to the cloud and to a network drive. It doesn't even need to be a fire. A thunderstorm can be enough to kill a setup.
Of course most if not all of those providers intend to make something out of it. What goes round comes around(work).
It does not have to be OneDrive or any Ms. I have used a free option from Mozy for a few years. It worked well and never had a problem. I'm even paying now for a 50GB(work files) option. Nothing wrong with that.
The network drive I have to replace soon as it has been going for a number of years
No free lunches
I just hoped I would get that amount of storage because onedrive is always my friend ever since I got my new win8.1 pc its always been there. Lets just hope that carries on
I know that there is no perfect disaster recovery plan but I try to follow the rules and guidelines I was taught when I was actively involved in the IT field and they have served me well over the years. YMMV