--big-backup

Ordinarily, the tool backs up the current save files into "savefile.backup", overwriting the existing backups if one already exists.

With the --big-backup switch, it'll save it with a timestamp. E.g. savefile.backup20140717-11-42-65

Caution: Space Engineers saves can get large in size and constantly saving every backup can take up a lot of space if you've got a large server.