Real Estate Investors- which website/program do you use to store your content digitally?

I'm old school, and I keep my books in individual (by the property) binders. I have no issues with this, but my fear is that if something happens to those particular binders, it would be a major pain.

I'd like to scan and digitally upload these binders.

FWIW, each properties binders:
closing disclosure
insurance info
warranty info
deed
appliance info
tenant's application
tenant's lease
and a log of all money going into the property and going out (rent)

Should I just scan and upload it to a website like Dropbox?