iPhone backup strategy question
I have an iPhone 8+ which I use with my High Sierra system. It has iTunes content, iPhoto content, and a bunch of apps. I've got a ton of space being used by by the backups (in the MobileSync directory) and I'm wondering the following:
1) do I really need these backups? don't they just duplicate my iPhoto and iTunes content? If something happens to the phone, can't I just connect the new phone and sync and get everything back?
2) what about my apps and settings - is there a way to back those up without backing up the media files?
3) is there a way to trigger a full backup to a different location (on another disk)?
iPhone 8 Plus, iOS 12