Recently I've been researching NAS (network attached storage) and came across two products that look pretty darned cool and are budget friendly....

Synology DS211J - $209
http://www.newegg.com/Product/Product.as...8-065-_-ProductComes with no HDs installed. Has 2 bays so you can run it as a mirrored raid if you want redundancy or 1 big raid disk. You can attached it to your router and you're good to go. What's really neat is you can do a whole lot more with it then you might expect.
See here...
http://www.synology.com/enu/products/DS211j/index.phpAlso check out the live demo of the built in software...
http://www.synology.com/enu/products/demo/index.phpCool!

Also, for drives, how can you go wrong with a WD 2 TB for $89? Runs cooler with greenpower technology
http://www.newegg.com/Product/Product.as...6-514-_-ProductPop 2 of these babies into your Synology DS211J and you've got a low-power, web accessible, network accessible storage solution that'll work great be it Mac or PC. Hell, you can even host a web site on it. Total price is $387.
Also, check out Carbonite, Amazon S3 or BackBlaze for offsite backup over the web.
http://www.carbonite.comhttp://aws.amazon.com/s3http://www.backblaze.com