Autosave from field?

[Richmond]

Merry LibreOffice allows one to set it so that it autosaves a document
at a set time interval in case your computer goes wonky, or LibreOffice
crashes.

And a jolly good idea that is too (even if they pinched it from Microsoft).

Now I would like to have the same sort of feature in my "next thang"; the
up-and-coming-and-sweeping-all-office-suits-before-it 
'Richmond-Scrubby-Cupboard'
(well, round these parts that's what passes for an office) made,
needless to say, entirely in Livecode.

Obviously, central to my text entry component "Wobbly Word",
there will have to be a field, and any autosave feature will have to 
save and/or export
and/or overwrite a rtf and/or html document at regular intervals.

Now what I don't understand is how to have a script working away 'in the 
background'
checking the time and autosaving every 2-3 minutes without it 
interfering with
user-initiated scripts in the foreground or the reverse.

Richmond.