lost my map

I have added several items on the dude and worked fine for a while, but then 1 day we had a problem with the electricity and the pc got shut off in 1 sec.

before that I was closing and opening the program without problems, and all elements were present on the dude map.

after the electricity problem (black out) we lost all the elements we introduced … is there a way to save the map/elements to prevent such a problem ?

thanks
Gianluca