After about 10 months of deliberation, I finally took the plunge and bought some Network Attached Storage (NAS). Got the Thecus N5200 PRO with 5 X Hitachi 1TB Harddrives. After 6 hours, it is still building the RAID 5, but I can already start copying my files to it - getting 20 MB/s throughput. Should be quicker once the RAID 5 build is finished. GigE on both ends.
I have been concerned about backups for months. DVDs and DVD DL are just too small/slow for projects nowadays. Bluray is just to expensive. Standalone Harddrives - too worried about failures, hence the RAID 5 system - a good balance.
As a bonus, my USB printer can now be accessed from both my PC and laptop. The unit includes a USB print server, so is now accessible over IP.
Not sure how many people run NAS, but so far I am impressed.