Before getting all crazy and changing the setup why don’t you try Wi-Fi. Yes Wi-Fi. Your cable might only be 100mbit and your WiFi may be faster.
Wi-Fi 5 can theoretically transmit data at speeds of up to 3.5 Gbps. And obviously WiFi 6 and 7 are even faster.
Don’t over complicate it. 3 copies: backup, main, and offsite; 2 different media: hdd and data center; 1 offsite. I like blackblaze but anything from google to Amazon will work.