Pages for iCloud automatically saves your document in the document manager as you work. If it’s a new document, it’s given a default name, such as Blank. You can rename your document, or create a copy by duplicating it at any time.
Note: You can also download and save a copy of your document in Pages, PDF, Microsoft Word, or EPUB format. See Download a document.
Do one of the following:
With the document open: At the top of the document, click the document’s name, type a new name, then press Return (on a Mac) or Enter (on a Windows device).
In the document manager: Select the document, click the More button 
that appears, choose Rename, then type the new name.
You can duplicate a document, make changes to the copy, then save it with a new name.
Note: If you duplicate a document you’ve shared with others, the copy isn’t shared.
In the document manager, select a document.
If a document is open, click the More button 
in the toolbar, then choose Go to My Documents to return to the document manager to select the document.
Click the More button that appears, then choose Duplicate.
A number is appended to the duplicated document’s name. You can save it with a new name, as described in the task above.