Quick bit of background:

I am currently using a QNAP TS-459U which has 4x1TB HDD that are configured as Raid 5, this stores the whole schools backup. As everyone who works in a secondary school/medium sized buisness knows this isnt alot to backup everyones personal areas and shared areas even if you have scheduled incremental backups.

I am looking at either using another NAS unit with larger disk space or even open to another solution as long as its cost effective.

Whats everyones thoughts?

Thanks

Dan