Not to forget NextcloudPi from ownyourbits
DietPi is a nice basis for low mem SOCs, as it is reaaaly slim (compared to Raspbian Lite), but for now the Nextcloud installation there is not too complete/lacks some features. I am working on an optimized installation script (on github), just didn’t found time to go on the last weeks: [SBC][DietPi] Optimize Nextcloud installation
But off topic… 