[mendort]

Sometimes 'dispose of' means 'accidentally drops in a lake'. Accidents happens, and inadequate backups are part of the human condition.

[scholia]

True, but the original photos are not on Twitpic, and they can always right-click and save them from the web interface.

Anyway, that's an extreme case, and web services are typically not set up to deal with extreme (in fact, totally hypothetical) cases.

I still haven't seen anybody put up a rational counter-argument. Does that mean nobody can?