It is quite practically impossible to get the Previous Page with the Unique Visitors or Visits metrics.
Consider this simple case of one person's journey:
Page A -> Page B -> Page C -> Page B -> Page A -> Page C -> Page D -> Page A
The previous pages for Page A are: (entrance), Page B and Page D
Which one should be reported? And more importantly, how will you make sense of the data to make it actionable?
The Flow visualisation is probably a better tool to use to see which sets of pages are the previous/next ones for a given Page.