You can keep the generated files from rss2book on your PC. There are two few other issues standing in your way:
- rss2book requires you to manually click Go to start its work
- the file names are not date stamped
These are both pretty easy to address. However, having addressed them, they introduce the complication that rss2book expects to sync the latest documents to the reader, not documents from an archive. If you would be sitisfied with using the Connect software for that, then I can address the first two issues.