I have an idea for a way to modify the behavior of "save changes with
backups" so that it will be more useful for some users, such as
myself.  I *believe*, from what I've read so far about customization
of TW, that a plugin could be written which would achieve the desired
effect.  However, since it would (as mentioned) override a default
behavior of TW, I am not sure I understand how one would go about
writing such a thing.  I'd like to hear from those more experienced
with TW development?

A quick description of exactly what the plugin would alter about the
process of "save changes with backups":

* Under the current behavior, when changes are saved, the "backup
file" which is created contains *all* the TiddlyWiki code, and the
content of *every* tiddler in the file as it existed at the time of
the last save -- even if the tiddler has not been changed since that
time.

* Under the new behavior, the "backup file" created would consist of
*only* tiddler content, and only those tiddlers which have changed
since the previous save.

For those who (like myself) are using TW on thumb drives with fairly
low storage capacity, this provides an easy way to retain old versions
of changed tiddlers, without incurring a ~300KB penalty each time
changes are saved.

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