Laptop backup solution?

I’m looking for good backup solutions for my laptop…

Here are the criteria I NEED:
1. portable
2. fast
3. reliable
4. cheap
5. 300GB-1TB capacity (My ghost images are 30-40GB compressed) so I can store many weekly backups before I need to delete anything.

Network access (so I can run the ghost backup wirelessly) would be nice but that’s just an extra.

I’m considering these possibilities but I’m not sure what’s best:
1. portable USB/FireWire hard-drive (I currently use this and make periodic DVD copies for redundancy)
2. used computer running FreeNAS with a RAID array (not exactley portable)
3. some form of expandable/upgradable enclosure

I have some concerns with RAID though – what if the hardware fails, would I be able to read the drives with another device or adapter?

Is there a cheap USB/Firewire enclosure that’s expandable – where I can put a drive in now and another later when I can afford it?

Is there another better option I can use?

You could use an external hard disk.

I wouldnt suggest DVDs as these could have the maximum of 8 GB (double sided or what) and after a few years there will be some data loss on them.
You could use flash drives, as i know you can find a maximum of 8 gb, its more reliable in my opinion.

But if you need like 300 GB then, an external hard disk would be great.
Look on:

http://www.tigerdirect.com/applications/Category/category_tlc.asp?CatId=8&name=Hard-Drives

You can find up in the left some options, (like external hard drives and others). I am sure you will find them, like if not then email me.

Or search at
www.ebay.com
www.amazon.com