[Newbies] Update Timer?

I am building a simple database using a tree and a ReferenceStream as learned here. I want it to update the disk file every 10 min. with the current tree. What should I do?

The classes Time, Duration, Stopwatch, Schedule, look like possibilities but the only method that looks good is Schedule "between: aStart and: anEnd do: aBlock" but I don't want it to hang waiting on the timer so the tree can't take my changes. How do I make something perform like a text editor that saves its work every 10 min?

Thanks,

Kirk Fraser