howtobackupiphonetoitune

GotoSettings>[yourname]>iCloud>iCloudBackup.·TurnoniCloudBackup.iCloudautomaticallybacksupyouriPhonedailywheniPhoneisconnectedtopower ...,,Backupyourdevice·Connectyourdevicetothecomputeryounormallysyncwith.YoucanconnectyourdeviceusingaUSBorUSB-CcableoraWi-Ficonnection.

參考資訊如下
Back up iPhone

Go to Settings > [your name] > iCloud > iCloud Backup. · Turn on iCloud Backup. iCloud automatically backs up your iPhone daily when iPhone is connected to power ...

Back up your iPhone, iPad, or iPod touch in iTunes on PC

Back up your iPhone, iPad or iPod touch in iTunes on PC

Back up your device · Connect your device to the computer you normally sync with. You can connect your device using a USB or USB-C cable or a Wi-Fi connection.