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Try the advice here to start with: Resolve issues between iTunes and third-party security software - Apple Support
Try the advice here to start with: Resolve issues between iTunes and third-party security software - Apple Support
How to back up your iPhone, iPad, and iPod touch - https://support.apple.com/HT203977
Restore your device from an iCloud or iTunes backup - https://support.apple.com/HT204184
Back it up to your computer using iTunes or buy more iCloud storage space.
Back it up to a computer, or temporarily sign up for an iCloud plan with more storage.
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Can’t back up from iTunes: because the sync session failed to start
From iPhone 4 to iPhone 6S
