Advice on major purchase desperately needed – edit to archive

[Steve Braker]

> If you want to archive online, use a codec that’s not tied to any one platform, like animation, targa, photo JPEG, Sheer, image sequences, etc.

I’m interested in this too… for the closes to true archival file storage I can get to (Don’t worry, we’re archiving on tape as well).

My question: which of these formats reliably hangs onto audio tracks, sync, and especially timecode, and is also expected to be generally and easily readable in 10-20 years?