I'm always concerned on backups and restores and noticed that a lot of the settings are maintained in the registry in a single key. To eliminate the need to reenter all those settings on a restore, I created a simple batch file to do that, but it required using the Windows command prompt and seemed messy. So I created a simple utility that does one thing: create an export copy of the registry setting. I tested it by completely removing TB! and reinstalling - and then importing my backup of the key. It worked. A friend asked for a copy so I documented it and then felt others may have a similar interest. The utility is available at http://davidkirk.org/thebat/ Maybe I reinvented what others have done, but it was educational for me, regardless. If you try it and have questions, my email and other info is in documentation in the zip file. I 'think' this should work on any Win 7 or newer 64-bit system.
When you do backup/restore using The Bat! internal means, you don't need to also preserve registry settings, because The Bat! does all this. But if you just copy files from your AppData, you should also save registry settings.
I appreciate your response, as backup and restore are important to me. I had anticipated the backup done by Tools>Backup to be complete, as you stated, but that is not what I experienced. To test my approach, I did a backup with Tools>Backup, uninstalled TB!, checked that no registry entries or files remained anywhere and then reinstalled, pointing to my Mail folder. I started TB! and used Tools>Restore, expecting everything to be as before. But it wasn't. There were still settings I had made that weren't there. I didn't document all of them, but a quick check showed missing settings. When I double-clicked my registry backup to restore it everything was back to normal. I repeated the test, ignoring the restore file from Tools>Backup and just used my registry backup file and that fully restored TB! to my settings. For a disaster restore, that seems to fully cover the issue, although I respect that Tools>Backup serves another purpose. .
You mentioned Appdata files, but I don't see any. My backup was just the Mail folder and my registry backup file. Thanks for your comment and I will appreciate any insight you might share on the steps to do a restore after a crash or moving to a new PC, as those are the situations I am working to address.
Thank you for your effort to assist the rest of us in being able to fully backup/restore The Bat installation. I have downloaded and executed your executable program, and it worked perfectly. Thanks for your help!