*How can I copy an entire website to another domain in the same hosting account?

If you have 2 domains in 1 hosting account and you want to move the website from one domain to the other, the easiest way to do this is via DirectAdmin.

In DirectAdmin, click the Files/Bestanden button. Choose domains, then the domain you want to copy and then public_html.

Next, click Advanced search/Geavanceerd zoeken at the top right, select 'all / alles' for items per page and click Search.

All files and folders in public_html are now shown. Then click the 'select/selecteer' column. All files are now ticked.
Next, click 'Add to clipboard/aan prikbord toevoegen'.

Now go to the public_html directory of the domain you want to copy the site to (it is best to empty the public_html folder first). There, click 'Move clipboard files here / Verplaats prikbord bestanden hierheen'. You can also choose the copy button if you do not want to move the files.
Everything should now be copied to the new directory.