OneDrive for Business comes with most Office 365 plans, so you may have it and not realize it.  You get ONE TERABYTE of storage with your subscription, plus it allows you to share and collaborate with a greater degree of security that with comparable services!

 

https://support.office.com/en-us/article/What-is-OneDrive-for-Business-187f90af-056f-47c0-9656-cc0ddca7fdc2