If you want to reduce needed disk space on your USB stick or harddisc drive you can easily do this with the Dolphin emulator itself. Go to Batocera file explorer. Change to applications and open Dolphin. In Dolphin select the file(s) and use right click to convert it to a smaller rom file size. It seem that RVZ files are recommended.
When you delete files in the Batocera file explorer they are moved to the trash. But when you open the trash it is empty and it is not possible to clean/delete the trash. This are my observations so far.
Go to applications an open xterm. Then use the following commands to clean the trash.
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