Help > FAQ > Backup & restore sound list
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To restore a backup select Archivo > Restaurar la lista de sonidos from the menu.
Soundpad stores a working copy of the currently loaded sound list periodically and on application exit at %Appdata%\Leppsoft (equal to C:\Users\Username\AppData\Roaming\Leppsoft\soundlist.spl).
If you accidentally clicked on a table column and sorted your list, you can select Editar > Deshacer from the menu to get your old sort order back. But, if you already closed Soundpad then the working copy was updated and the undo history is gone.
If you want to prevent sorting of the list at all, so it doesn't happen to you again, you can do so by checking Archivo > Preferencias > Interfaz > Deshabilitar la ordenación en la lista de sonidos.
More info: Managing sound lists.