iCloud back up
Why does an iCloud backup take so long over Wi-Fi
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Depending on the quality and speed of your wifi connection, and also depends on the amount of data that is being backed up. Making frequent backups-once every 2 to 3 days will take up less time but it all depends on how fast your internet connection is.
Download the speed test app by Ookla available on the play store to check the speed of your internet connection.