@Edgaras You can do that already actually. As always, TW is very flexible 
when it comes to these things. The code Jeremy has provided is just an 
example of how to leverage the new capabilities. Ohter users may have 
different use cases and needs, so the flexibility is key. What would be 
useful is perhaps documentation of other ways to use the new capabilities.

In fact setting it up the way you describe, would be an excellent exercise 
for an interested beginner like yourself, seeking to better understand how 
filters and actions in TW work. 

The steps involved would be to customize the button to:

   - save the last export date to a tiddler, see docs for ActionSetField: 
   https://tiddlywiki.com/#ActionSetFieldWidget
   - customize the list filter around tm-zip-render-file to only include 
   tiddlers since that last export date. See docs for compare operator 
   https://tiddlywiki.com/#compare%20Operator (hint: you may need a nested 
   list)

Regards,
Saq

On Friday, May 8, 2020 at 12:12:57 PM UTC+2, Edgaras wrote:
>
> This is very helpful *Jeremy*! Makes TW an even more competitive Static 
> Site Generator and CMS.
>
> I have a suggestion that removes the need to export the whole site every 
> time:
> What if we check the "Last modified" field of every tiddler and export 
> ONLY those that were modified after the latest export?
>
> That would be brilliant, because it would not need to export the whole 
> site everytime!
>

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