If it’s something you’re worried about, you can move the data files to another location or your cloud storage of choice. I can’t think of why it would get erased, but bugs and mistakes can happen.

Emudeck seems to store its files in the “Emulation” folder, in a subfolder named “saves”. It seems that’s next to where it keeps your ROMs. Using the file explorer in Desktop mode, you can copy-paste this folder somewhere else (or pull it off the SD card entirely), so if the Emulaton folder does get reset, you can just copy things back into it. Although some emulators do use links to other folders (think like shortcuts), so check that out for any specific systems you emulate. If it has a small “link” icon, then you’ll need to copy the files inside directly.

Of course, this is all if you want to be paranoid and 100% sure. I’d be very surprised if Emudeck erases any user data on a reinstall.