Just a further thought. I think that before I put these private documents into the .dmg, I could, firstly, put the document into a thumb drive and safely store the thumb drive elsewhere until I am confident of the use of the .dmg.
Any comments and am I making sense?
You guys should know that I am a man of VERY senior years and not a natural in the computer world. It maybe that you might think I am asking stupid questions, if so, sorry.