Just after peoples opinions on this and if its a good way to go or not.

Primary school
1 server that does everything.
1 NAS box that is used for some shared areas.
208gig of user data.

Looking at a cost effective way of backing up.
Have been speaking to someone that suggests we sign up to the office 365 A2 plan.
We have office 2010 with licence code full licence. Not perpetual.
The theory is we will have enough users with the 500mb per user to accommodate some of the data (say the teachers shared )
we can then use online share point to recreate the teachers shared are which then gets backed up online?
It still leaves me short on backing up the pupil area and the image of the server