How to backup iphone?

To back up an iPhone to iCloud, connect to Wi-Fi, open Settings, tap your Apple ID name at the top, select iCloud > iCloud Backup, and tap Back Up Now.3 Ways to Back Up Your iPhone1.Back Up Using iCloud:Method 1 (Wireless).Connect to Wi-Fi. Open Settings, tap your Apple ID banner, go to iCloud > iCloud Backup, make sure Back Up This iPhone is toggled on, and tap Back Up Now.2.Back Up Using Mac (Finder):Method 2 (Mac).Connect your iPhone to your Mac using a USB cable. Open Finder, select your iPhone in the sidebar, choose Back up all of the data on your iPhone to this Mac, check Encrypt local backup (to save health and password data), and click Back Up Now.3.Back Up Using Windows (Apple Devices / iTunes):Method 3 (Windows PC).Connect your iPhone to your PC via USB. Open the Apple Devices app (or iTunes), click the Device icon, select Summary, choose This computer, check Encrypt local backup, and click Back Up Now.Comparison of iPhone Backup MethodsFeature / DetailiCloud BackupMac (Finder) BackupPC (Windows) BackupConnection RequiredWi-Fi ConnectionUSB Cable / Local Wi-FiUSB CableStorage CapacityUses iCloud storage planUses Mac internal driveUses PC internal driveAutomatic Backups?Yes (Overnight on charger/Wi-Fi)Manual (or when connected)Manual (or when connected)Encrypted Health DataYes (Built-in security)Yes (Requires password setup)Yes (Requires password setup)What Data Gets Included vs. Excluded in iCloud BackupsIncluded: App data, device settings, Home Screen layout, iMessage, SMS, MMS, ringtones, purchase history, and health data.Excluded: Data already stored in iCloud real-time (such as iCloud Photos, Contacts, Calendars, Notes, and Keychain passwords) to prevent storage duplication.