[Andrew]

I'm not familiar enough with the architecture to be too technical, but basically it forces OmniFocus to write out the database in a form that coalesces all the transactions. (If you looked inside the document wrapper before running the script, you would probably have seen a lot of zip files. Afterwards, just one zip file, though the number will go up some as you use the app, then hopefully stay roughly steady depending on how frequently all clients get synced together.)