Look here:
C:\Users\mannis\AppData\Local\Microsoft\Power Automate Desktop\Console\Workspace
Replace your username. I only have 2, but part of me thinks that is because these were both back when I had a paid subscription, so if you have a paid subscription, it's possible that all of yours would be saved there.
Each one is a folder:

Inside of that, you want the "script.robin" and it has everything like the copy and paste but more because it's all inclusive. Also, per files, it looks like the imgrepo and appmask files are important per flowID, I would make sure you have all 3 as a solid backup.
I found 5 more of my flows here, in the designer folder:
C:\Users\mannis\AppData\Local\Microsoft\Power Automate Desktop\Designer\Temp
I don't know what the difference is between designer and console, but I have 38 flows, and can only find 7, so hopefully you have better luck.