Here is the answer I sent to my fellow board members:
Here are three options when your Dropbox account is full:
What is Dropbox?
It’s a free way to store and share large photos, docs, and videos files (i.e. too large to email) with others. You can send any file instantly to anyone, whether they have Dropbox or not. Anything you add to Dropbox will automatically show up on all your computers, phones and even the Dropbox website — so you can access your stuff from anywhere.
Why use Dropbox?
I use Dropbox to share files with my virtual assistant, a business partner, my sister, and the aforementioned board. I also created a file of head shots, so it is easy to share them with a link when I am asked to speak.
If you’d like to open a free account, use this link and we’ll both get 500 MB of bonus space – so neither one of us will have to worry that our Dropbox is full.