Chris
There is no concept of "backing up" here. Writer creates a temporary folder every time you open a document to hold its working files.
You have a file Tom.odt. When you open it to edit it, Writer creates a temporary folder abcdeFgh.tmp, and puts a copy of Tom.odt in the folder as a file called abcdeXyz.tmp; and puts each image from Tom.odt in the abcdeFgh.tmp folder as a file abcedPqr.tmp etc, where the first five characters are the same. When you make edits, Writer saves these edits in abcdeXyz.tmp. Incidentally, abcdeFgh.tmp is dated when you last saved it whereas the image files abcdePqr.tmp are dated at the time they were created in the folder.
It you now open Dick.odt as well, Writer creates another temporary folder jklmnOpq.tmp and puts a copy of Dick.odt in it etc.
When you close Writer both these temporary folders and the files inside get deleted.
Several other points
1 If you want to open the temporary files in the folder you cannot because Writer owns them. But you can take a copy of them and paste the copy into the same folder. You can then open the copy
2 If you open Harry.doc, then Harry.doc is not copied into the temporary file - instead a file of zero length appears in the folder. You cannot use this method to recover .doc files - it only works for .odt files.3 Your folder contents look strange to me. You have an actual .odt file in the folder - I only ever have .tmp files.
4 A correction - I have previously said that "all the files in my temporary folders have the same first five characters as the first five characters of the folder name". This is incorrect - it seems that only the first two characters are the same.