Do back up in one plus 7 takes extra storage??
You shouldn't have the backup file in the phone storage... Backup to a harddrive or cloud.
I backup to oneplus offical but its took my extra enternal storage
If it takes internal storage, you have the backup file in internal storage... Move the file!
Backup occure in cloud it's doesn't use any extra storage
Backing up to Lap will store huge space on your device rather then storing on your mobile.
Backup is being stored in cloud storage therefore it doesn't occupy internal storage.
Do backup then save your files through cloud storage or pc prior to factory data reset.
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