
This month's joke is based on the double of meaning of back up:
Back up: to move backwards. When driving we also say 'reverse'.
"Back up your car into the garage."
Back up: A Back up, as in 'a back up plan', is kept in reserve to serve as a substitute, if needed. So if the original plan is not working, you use your back up plan. It is also known as 'plan B'.
"Don't worry if we can't buy tickets for the show. I have a back up plan - Tom works in the theatre. He should be able to get us some."
Note: In computing, a 'backup' refers to a copy/duplicate of a file, in case it gets lost.













Comments
When is it necessary?
I think in difficult situation it is necessary to have a back up plan.

Thank you for the Lesson.
I back up very good if I can't drive onwards for any reason w...
I can back up very good anywhere if I can not drive onwards for any reason whatsoever
Thanks for the lesson.
Have a nice day/night/week/weekend!
Wherever you're far away.
thanks
Back up
The farsighted people always have a back up plan. He backed up his car so she was able to drive by. Don't worry to overwrite these files I have a backup copy.
gREat
a Great lesson Come frOM Great Teacher
Back up
Try to work hard on something so that you needn't a back up plan
Thanx Chris