With the decommissioning of my old computer, I really took notice for the first time of a strange limitation in WHS – there’s no way to export an image of one of your computer’s backups to a compressed folder.
I’m officially retiring Tombstone, as you already know, and I’ll want to remove it from the “Computers & Backup” tab in the not-too-distant future because I’m a neat freak and because I hate having yellow things in my Home Network Status screen, even if I can check “ignore this issue” to get my thing back to green.
So, with some google-fu and a lot of time, I managed to mount, export and compress Tombstone’s final backup, which now sits on my desktop as a 275GB .wim file.