How do I see when a device was last backed up
I can't see what exact date my phone was backed up. I know it has been about a year however how to I find all my pictures that were on my last backup?
iPhone 6
It would certainly help a lot to know whether you're asking about an iTunes backup or iCloud backup.
For iTunes, open iTunes on your computer. Use iTunes' menu to click the leftmost item in the menu, followed by Preferences > Devices. There you will see backup dates.
For iCloud, assuming you're using iOS 10.X.X, go to Settings > [your Apple ID] > iCloud > iCloud Backup. You will see "Last Backup" at the bottom.