ARGGG!!! Lost my custom version!!!

What has happened? Today I've open my custom version in my long process of customizing my selection of cards and I've found that they are ALL GONE!!!
Both in the editor and opening the MagicCustom.exe file.
Just the card arts are where they are.
I've already moved a large number of cards and starting back is really an awfull work.
Which file do I have to back-up each time? Can't the program make one of them automatically?

Both in the editor and opening the MagicCustom.exe file.
Just the card arts are where they are.
I've already moved a large number of cards and starting back is really an awfull work.
Which file do I have to back-up each time? Can't the program make one of them automatically?
