Affordable RAID1 USB external enclosures exist, just put your own drives in it.
You can buy a NAS that does RAID5 for cheap.
Keep in mind that a 3-4TB disk in RAID5 will take about a week to rebuild. 3TB or larger you really need RAID1, RAID10, or if you're a stingy bastard then RAID6.
I keep all my crap on www.powweb.com
encrypted with TrueCrypt.
I have an AWS account still (tried using it for "anywhere" data and it sucked) but I haven't used it in at least 3 years.