[Feature request] Ask user if they want to overwrite an already-existing NAND backup before starting

[superrpotion]

Hi, just wanted to request this feature. The reason being I backed up my NAND while following dsi.cfw.guide, but while trying to follow TWiLight Menu's instructions to change my SysNAND Launcher and view a .app's name, I ended up launching DumpTool while holding A+B and then starting a new dump. I canceled it immediately after starting, but it proceeded to overwrite my original NAND backup with a 1 byte file. I hadn't copied the file to my computer yet so I didn't have a backup, and when I tried to recover the file via Recuva, it said it could only do a partial recovery.

Would it be possible to add a popup dialogue where the user selects "Yes" or "No" to overwrite the previous NAND backup .bin file? Or allow it to create separate NAND backups, so it doesn't overwrite anything.

Thanks