Updating your iOS or iPadOS system is a good time to backup your iPhone, iPad or iPod touch content in iCloud. On the Apple support channel on YouTube there is a tutorial on how to do it for several days.

To backup to iCloud you have to open the Settings application, tap on the first position in the list with your photo or picture. Then tap on iCloud, select Backup in iCloud and tap on "Create backup now". However, you have to remember that in most cases you will need enough free space in the cloud. A free plan may not be enough for this.

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