I got the same issue. I'm on my way to a forest cabin without Internet access
and would like to download all the pages I could possibly want to use while
out there. This adds up to a very long list of sites and I seem to keep
forgetting sites that I think I need. Without the capability to rebuild the
index, how would I go about this? Adding a new site doesn't corrupt the
achieve but index.html is rebuild with just the new sites and the old ones
seem to be forgotten though they are in the folder.

This is just tedious...