I'd rather sacrifice some download performance and join the queue waiting for synchronous DSL at domestic prices.
As proof of this I yesterday trialled an online backup service in addition to the four level backup I already take.
Performing a pro-rata calculation on the 19 hours it took to backup 2.5GB of data (for much of the time the tool was using the maximum percentage of available 448kbps upload bandwidth that it is designed to do), my photo collection (and only photos, none of the video) would take 119 days of continuous crunching to backup. The videos would take over a year.
Makes a bit of a mockery of the "unlimited storage" that the service offers!
BTW - off on a tangent - one nice part of the backup is that I have access to the files on my HTC Desire; I can download them without affecting backup integrity. Nice not to have to remember to copy documents first that I want to browse during "dead" time on my travels.