Shared Distributed Music Backup System

I have a cunning plan.

Buy a few 1Gb USB sticks. They only need to be 1Gb. Backup an album or two that you have to a USB stick. Give the USB stick to a friend that doesn't have those albums.

Now you have an offsite backup of those albums.

Your friend might to listen to the albums while storing them on your behalf. (This would be out of your control, alas) If they did listen to the albums however, they might be convinced to acquire it themselves. When they do acquire it, they'll want their own offsite backup and so they give the USB stick to a third person. ad infinitum.

In this way someone always has an offsite backup of the album somewhere.

There may be some other side effects that I haven't identified yet....