Pages annoyances!

1. A Pages document, or a Word .doc document? If a Pages document, you initially manually save the document via the File menu, and after that is done, any subsequent changes in the Pages document are autosaved. No need at all to duplicate the Pages document before Exporting (or printing) to PDF.
   1. If you are referring to a Word (.doc) document, then once it is opened in Pages, the content is translated to Pages internal document format and the original Word document remains unchanged.
2. Changing the name of a Pages document only updates that name in the Finder without saving or changing its contents. Pages retains versions of your document changes, so there is no reason to duplicate the document with every editing session. That just produces confusion.
   1. Pages is not a Word clone and Apple made no attempt to endow Pages with Word features. You might be better served by using MS Word on a résumé, because if you are required to submit a Word document and not a PDF, the applicant tracking software will assume it is scanning a document created by MS Word.

Each resume and cover letter should be difference based on what the job posting is telling you and how you can position your quantified results experience on both documents. I used to make the cover letter the first page and subsequent pages the resume — in one document. That avoids the recipient losing your cover letter.

Unless you are physically handing someone a hard copy of your resume, understand that most electronic submissions are scanned by application tracking software which has about a 96% rejection rate. Human resources are not looking for the best or brightest person for the job, just those that are "good enough" to pass off to the hiring manager as interview candidates.