Losing software - template installed software disappeared

I installed my software to a debian 11 template from the repository. One day the software from the connected qubes wasn’t available anymore. I’m not sure if it was due to an update… I know I’ve done updates in the past and it didn’t affect the software. I reinstalled the software from the repository and everything is fine now.

For my standalone, however, I’m having to redo a lot of the software installations. I’m still in the middle of it. The process is a little more involved, but I’m sure I’ll be able to get it back together.

Anyone have experience with this? I’d love to know how to avoid reinstalling all the software in the future. Thanks