SanDisk iXpand User Manual page 15

You can also pause the back up at any time by tapping on the pause button.
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Backing Up may take longer than normal the 1 time. Once set up, only newly added
files will be copied to the iXpand Drive.
Note: A pop-up will appear if the initial camera Back up was unsuccessful. You can
change this by going into the iPhone settings screen and enabling the iXpand Drive
to access the iPhone photos.
If you have data on your camera roll of your iOS device and you have iCloud photo
library enabled on your phone, backups with the iXpand Drive may take longer than
usual during the initial backup process.
If iCloud photo library is enabled, we suggest that you use Wi-Fi so no data charges
are accrued.