Military Findbuch E297 online at: Hauptstaatsarciv Stuttgart
To use the collection click on the term to the left of the screen: "Stichwortliste" Then choose the "Ort" [Place] or Personen [Officer's list] or Sachen [Topic] to see the digitized images. Clicking on Sachen and then choosing the letter "I" will bring up the names of the Infantry Regiments.
Stammliste Recruits 1860 includes Oberamt Backnang: Recruits 1860