"i use usb drive for backup" x2
(external HD to be more specific)
Viewing post in What cloud storage are you using?
I don't have a favorite one, each company I worked for had a different one, some use google drive others use one drive.
If you want an interesting one, I had a professor back in university that created this one: https://dontpad.com/
There you can type any link to generate a new space, the downside (which is also funny) is that you can access links that people had already created.