Thanks for that, I'll be happy to proceed nowThat you can. There are certain things which aren't included in the backup (which you may already know) such as iTunes purchases, which you can add with the transfer purchases option in iTunes. iCloud photos, which will sync back with iCloud again once set up. Keychain information such as Safari passwords (unless you use an encrypted backup, then they will.)
For a full breakdown of what isn't actually included in the backup, check the Apple support document here.