Working out how much back up space you need for your phone or other device can leave you second-guessing yourself. Many people simply look at how much space they’re using and then pick a backup plan of the same size.
Realistically you need a lot more than that to account for additional backups and all the extra files you add to your phone over time.
To accurately calculate how much back up space you need, firstly take a look at your phone’s total storage capacity, which is usually found in the Settings menu and listed in gigabytes (GB).
Don’t forget to account for any additional expandable memory cards if you have an Android phone.
Next, take that number and multiply it by either three or four. This ensures you have enough space for multiple backups plus some left over as a buffer just in case you need it.