How much free space do you need to back up to iCloud?

Speaking of iPhone backup destination, it is a computer or iCloud. There is also a way to use other cloud services, but the free plan does not have enough space, so if you add it, it will not be much different from iCloud, and the target apps will be limited. You can also get a sense of security that you can back up/restore using the system's standard functions, so it's safe to choose a computer or iCloud.

In terms of ease of work, if you leave it connected to Wi-Fi and power supply, iCloud backup will be automatically executed late at night. is determined to be reliable, the backup will not start. If you get a warning like "You can't create a backup for this iPhone because you don't have enough space in your Cloud storage", that's it.

However, it is possible to find out how much storage space is needed before the backup begins. First, open the screen in the order of "Settings" → "Your name (Apple ID)" → "iCloud" → "iCloud Backup" and turn on the "iCloud Backup" switch.

If there are no problems, the iPhone you are working on will be displayed on the iCloud Backup screen. When you tap it, the space required for backup is calculated for each item such as apps, and the total amount is displayed in the "Size for next creation" column on the "Information" screen. In other words, this "next creation size" is the space required for the iCloud backup to be performed from now on.

If your contracted iCloud storage capacity is less than the "next creation size", you will have to upgrade your storage plan (increase capacity for a fee). However, if you use the "Information" screen to reduce the number of apps to be backed up and exclude photos/videos that tend to increase capacity, you may be able to make it in time. Check it out before rushing to upgrade.