It must get backed up somewhere - I read recently that a huge cache of Thomas the Tank Engine assets were leaked online (not sure which incarnation but obviousl

It must get backed up somewhere - I read recently that a huge cache of Thomas the Tank Engine assets were leaked online (not sure which incarnation but obviously a semi-recent one). I'd guess at least the big studios preserve for sequels, re-releases, remasters etc but who knows what the retention is.