Data Transfer
How to cancel it ?
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Did you Use Quick Start to transfer data to a new iPhone or iPad - Apple Support (IN)
During the Quick Start process, your iPhone will create a temporary iCloud backup of your old iPhone's data, which will be stored for a few days to ensure that the transfer is complete. Once the transfer is finished, the temporary backup will be automatically deleted.
If you don't want to use Quick Start to transfer your data, you can still back up your old iPhone to iCloud or your computer and then restore that backup to your new iPhone. This method will also transfer your data, apps, and settings, but it may take a bit longer than using Quick Start.