iPhone Photo Library or Backup?? So confused!
I am extremely confused on whether to use or not the iPhone Photo Library.
As I understood it, if I toggle the option, then my iPhone and iCloud will be perfectly synced, i.e. any change (including deletion) on one will be mirrored on the other. From what I have read, if I toggle the option then this will be the only 'back-up' and the regular back-up will not include Photos. Is that correct?
Should something then happen to my phone, when I get a new one can I restore my photos from the Library copy? Am I right to believe that someone could easily hit 'delete all' in my phone which would then sync and kill the 'back-up'?
If I switch to a new device, how does the sync work? Assuming the new phone is now empty, would it sync to download the photos from the Cloud Library, or would it sync to delete everything from the Library?
Is there a dummy guide? I am very confused as to toggling or not the iPhone Library feature.
Thanks!
iPhone SE