Ciao,
we have a small office as well (less than 10 people). We mainly use Sharepoint to have an online database of issues, let say a list o issue. In my opinon the advantages in using Sharepoint are: All infos are web server based, not simple cloud storage. The access policies can be at highest levels. The Sharepont server can send emails to proper people when triggered by some event. The editing of files is more reliable than simple cloud.
This is my opinon.
Moreover we have it for free since is was included in our MS Small Business Server.
Kind regards.