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Moving server data to Office 365 - best practices.

A client of mine has asked me to help move their data from Server 2008 shares up to Office. The business is small, with only 14 users, and the data is 70GB a series of folders - General, Staff, Accounts, Managers, and Products - and those folders are currently protected by File level access using securtiy groups - Authenticated user, HR, Accounts, etc. 

I am unclear about the best practice is for moving and securing the data in Office 365, should I be using Teams, or SharePoint with subsites and site level access control? Or OneDrive for Business The more I read, the less certain I am about the current paradigm.