Jeff Hostetler knows what it's like for a backup QB to achieve Super Bowl glory ... and he's passing his wisdom to a guy who's in his exact same shoes -- Nick Foles.
Just like Foles ... Hoss was #2 on the depth chart when the 1990 Giants started the season -- but got the starting gig when Phil Simms got injured in Week 15.
Everyone counted the G-Men out ... saying a backup couldn't lead them to a win. Hoss proved 'em wrong, throwing for 222 yards and a TD.