I need to urgently do both these saves:
  - do these on command (via Seaside app interface)
  - automatically on a timer

I've browsed a bit and found
    SmalltalkImage current snapshot:andQuit:

But this seems to require a confirmation. How do I bypass that?

I found STimer for timed block execution, but found no way to stop an 
STimer.

Help appreciated,

Sophie