Backing up iPhone 7
I am having an issue backing up my iPhone 7. iTunes is up to date. Phone is also up to date. Every time I try to update on the Mac I get a message that says “iTunes could not back up the iPhone “iPhone” because the backup was corrupt or not compatible with the iPhone. Delete the backup for this iPhone in devices preferences, then try again” The thing is I’ve never backed up on the Mac before. So there is no back up on the computer at all for my iPhone. I used to back up on my windows pc but I can’t now as it’s not a windows 7 pc. I don’t use the pc anymore so don’t want to buy windows 7 just to back up my phone when I have a Mac. I tried doing the iCloud back up but not enough space, even though nothing on iCloud. Only have the free storage as don’t use it. Apart from totally deleting everything on my phone is there any way to back up this phone. Thank you in Advance.
iPhone 7, iOS 11.2.6