Why is backup greyed out?

[Honey Beagle]

When wanting to backup my original iPhone the option to back up the phone is greyed out.

How can this be fixed?

 

[kataran]

If your referring to iTunes than try to update iTunes to the current version

After rereading your post it just might be the iTunes version doesn’t recognize your older device

 

[Honey Beagle]

Will do.