[wlesieutre]

But it's not clear that Instapaper is allowed to put the files in Documents. According to the Data Storage Guidelines cited in the article:

1. Only documents and other data that is user-generated, or that cannot otherwise be recreated by your application, should be stored in the <Application_Home>/Documents directory and will be automatically backed up by iCloud.

2. Data that can be downloaded again or regenerated should be stored in the <Application_Home>/Library/Caches directory. Examples of files you should put in the Caches directory include database cache files and downloadable content, such as that used by magazine, newspaper, and map applications.

I don't know if this is something enforced in the approval process, but it seems like Apple's intention is for redownloadable content to all be stored in temporary, wipeable locations.

[TeMPOraL]

Still, when user saves a webpage to Instapaper he/she probably wants to see it as it was when it was saved, and not magically updating itself afterwards. So I think that 'exactly this article at exactly this point in time' should qualify as 'content that cannot be recreated'.