Can I backup the AirPort Time Capsule hard drive to an external drive?

I currently backup an iMac and a Macbook Pro to an AirPort Time Capsule using Time Machine. I want to make a monthly backup for offsite storage. Can I simply backup the Time Capsule hard drive every month to an external hard drive to accomplish this?

AirPort Time Capsule (2013)

AirPort Time Capsule (2013)

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