

Agreed, nextcloud is a beast with lots of whistles, if you don’t need them you can have simpler solutions
This my approach here https://wiki.gardiol.org/doku.php?id=selfhost%3Afileserver
And I stated using AList which is a funny piece of software that has great potential. See here https://wiki.gardiol.org/doku.php?id=services%3Aalist
Just run backrest backup on each server three times, one for each remote backup tepository. Easy enough.