In order to prevent accidents, resulting in the loss of a large amount of data. The software automatically save the last 20 historical files. The file is located in Files->Resprite->_safezone folder.
You can move the files in it to the upper Resprite directory, and then you can view them in the software.
Folders with "_" prefix in Resprite's folder are internal data. Do not delete them, otherwise you will lose data.