I haven't found much information on the backstage Sync ability.

Yes, it's rather poorly documented I'm afraid.
Contributions welcome:
    http://tiddlywiki.org/wiki/Synchronization

How does this sync work? Does the sync work both ways?

That depends on the adaptor (and thus the backend) being used.
The FileAdaptor, which is the default and used to interact with other TiddlyWiki documents (whether local or on the web) only works one way, passively consuming content. That's because there are no facilities to to process data on the receiving end (it's just a static file). However, the TiddlyWebAdaptor, ccTiddlyAdaptor, MediaWikiAdaptor et al. allow for two-way communication. That means local changes can be pushed to the server (the ServerSideSavingPlugin, used by both TiddlyWeb and ccTiddly, simply uses the sync mechanism).

It's worth noting that there is no conflict resolution (yet?). So if you import a tiddler, modify it in your local document while it has also been changed on the server, there is no automated merging. This issue comes up when users import a plugin, change its tags (which constitutes a modification of the tiddler) and later want to upgrade to the latest version.

I've noticed that the sync dialog displays "linked" tiddlers. These
links were made while importing tiddlers from another file. Can I
remove those links?  Undo them?

You can disable that link by removing the respective tiddler's extended fields (in particular "server.host" and "server.type") - e.g. using Pascal's FieldsEditorPlugin*.


-- F.


* http://visualtw.ouvaton.org/VisualTW.html#FieldsEditorPlugin

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