I have a little (64gb, 2gb i5) Macbook Air with a smashed screen. It works just fine with an external monitor.

Recently my ISP changed my plan so I have a fixed IP address.

I run several websites, and one in particular - running a pre-Symfony version of eZPublish - uses rather a lot of disk space, and is a bit of a hog CPU wise.

I have a  VPS on Rimu, which is great, but I'm finding it hard to stay within the space limitations. So, I'm thinking of moving the the large site to a local server. Point is: would the Air be up to the job? It's very low power, has a built in UPS, has more disk storage and available RAM than the VPS. It also only owes me about $300, so would end up being comparable to just about anything else I can think of (a Raspberry Pi with a SSD would have quite a bit less power and wouldn't be that much less). I'm I missing anything beyond the fact that my uptime would almost certainly go from 99.99% to something a bit lower?

If I do use the Air, would I get much in the way of performance gain by using Ubuntu Server (which I've used before and don't have any real problem setting up) rather than just leaving OSX on the thing and switching off as many user interface services as I can?