Can I access a hard drive connected to my AirPort Extreme when I'm not home?

I would like to increase the amount of wireless storage I am using, without a monthly fee (like iCloud Drive). If I was to attach a hard drive to the AirPort Extreme, would I be able to access it while I'm not at home and/or not connected to the same WiFi?

Thanks

AirPort Extreme

AirPort Extreme

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