WHICH TT FILE IS MY CURRENT ONE?

I've noticed I have several TT files.

 

All have the .tax2021 suffix.

 

Some have a single ~.  Others have 2 ~.  One has 3 ~.

 

Even though I work on my taxes daily, the dates of these files in Windows Explorer range from 1-21-22 to 2-4-22.  (None shows today's date even though I just finished adding stuff today, 2-16.)

 

How do I determine which of these various files is the current one so I can then back it up?

 

Thanks for any help!

 

Alan