Office 365 offers numerous benefits; all the usual suspects of Office Suite such as Word, Excel and PowerPoint notwithstanding, Office 365 gives you so much more. Take a look at this infographic from Evoke IT to see for yourself.
With OneDrive you can sync all your devices to the Cloud which means that you can access your data from anywhere with an Internet connection on any device.
With SharePoint you can store, share, edit and organize all your files with your team so that everyone has access to the current up-to-date versions of all documents. With SharePoint online versioning is taken care of because you can “check out” a document and edit it without anyone else editing the same document until you’re finished.
Safety is not an issue with mirroring of your security permissions set up and tailored to each company individually. On top of that, each user also has their own sign-in permissions which are secure in any location on any device.