Do you have iCloud backups enabled? Even though this is uploading, it may still count against your overall quota. I guess you'd know if you were using streaming services like Pandora, etc.
Also, photo stream uses Internet even if you are on a local network. And make sure you don't have automatic downloads on for apps, music, etc.
Instead of powering down at night, you can turn on airplane mode from the control center to save some time.
And you might want to check if your ISP has unmetered downloads during certain hours. When I was on satellite, downloads between 2-5 am were not counted toward the quota, so you can maybe schedule some things for those hours if your ISP does this.
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