I made BorgBackup packages for OpenWRT (borg itself, and a number of new packages for its dependencies). Thought some people here might be interested.
The recipes are available here.
My initial use case is for a Turris Omnia router (equipped with SATA drives) to become a borg server for storing backups of my different machines, but the binaries would of course also work the other way around as a client, to backup stuff on an OpenWRT router to a remote borg server.
The packages should be easily compatible with at least OpenWRT 21.02, since this is the basis of Turris OS.
Is there any community interest that I propose a PR for inclusion of this packages set in OpenWRT upstream ?