Emacs calls its remembered copied or cut text the kill ring. Copy with M-w and insert with C-y, called yank in Emacs. The names do not imply that copying deletes anything.
evox-edit-notes, and run
M-x text-mode RET. Check the buffer with C-e m. Use an empty buffer
for this first copy, rather than inserting into an existing document.
evox-edit-source with C-x b and read the middle paragraph.
It is still there. The destination contains an independent text copy.
For a real document, check the insertion point and deactivate any unrelated selection before pasting. A copied newline moves subsequent text to another line; a copied blank line can preserve paragraph separation. Inspect the surrounding text as well as the pasted passage before saving.
During the transfer, C-e m and C-e l are useful checks. Avoid C-e f for filename inspection and C-e a for message repetition at this point: those commands also put their result in the kill ring and can change the next paste. M-x emacsvox-speak-current-kill RET inspects the current entry without inserting it. Another application’s clipboard copy can also change what C-y inserts.
If the text goes to the wrong place, stop and use Recover a text edit before saving rather than pasting more copies. For the general commands, see Yanking and The kill ring in the GNU Emacs Manual. Keep a reference and a draft in separate windows offers another way to manage the two working contexts.