Ask Slashdot: Best Offline Storage Method For Large Archives?

An anonymous reader writes "I have a collection of large projects (Indesign files with associated images), which are typically 40GB to 60GB each. In this current climate, what is the 'best' method of archiving these? Spinny magnets? Solid state drives? USB? Tape? Blu-ray? All have pros and cons and price considerations. If I remove the price issue (my data is important to me), does this change the choice?"