Google Docs is one of Google’s newest iPhone and iPad apps. Just be sure you don’t confuse it with the Google Docs service itself, because the Google Docs app deals only with word processing and text editing. If you want to access your spreadsheets, you’ll need to grab the Google Sheets app as well.
On your iPhone, install and open the Google Drive app.
In the top left, tap Menu .
At the top, tap Settings .
Tap START BACKUP.
How do I sync my Google Drive with my iPhone?
Start your backup