(First time poster)

I've searched the forums and MANY other outlets but have yet to find an answer to my problem. I have side-loaded some .mobi files via the Kindle Import homebrew app and have made various notes, highlights and bookmarks in those files. I wish to keep these files, BUT since they were not purchased via Amazon they are NOT backed up on Amazon's servers. So, I would like to export the notes and marks for backup on my PC. I've learned that such files are normally referred to as .mbp or .tan files (or even clippings.txt's?) but who knows since this the Touchpad app is a completely different animal from a standard Kindle ereader. Any ideas? And thanks for any help out there!