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If you’ve got a copy of the data that’s local, why are you opening up ports? Just run the backup job internally.
I’m also not fond of using SBCs as a NAS, by nature their I/O is extremely limited. It will probably work as a backup, but man do I not trust a USB interface at all.
I also recommend not relying on email for notifications - too unreliable. I use the healthchecks.io docker image and have it send me notifications via Pushover when something fails.
You don’t need to be home for a cron job to run.
USB has a bad habit of randomly dropping off the bus until you reseat the cable or reset the device.