I tried Borg for a brief moment when I used the Nextcloud AiO Container and it has Borg Backup integrated into it.
But then I tried Kopia and sticked to it. I wanted a unified backup solution for all my systems (Linux + Windows) and Kopia is doing that. Also it has a nice Web Interface and GUI Client, so it´s usable even for the people not that tech-savvy.
My Homelab runs 2 Kopia Containers at the moment. The first one is here to backup all my compose files and the Docker volumes. The second one is backing up my NAS to a cloud storage. I can access these 2 via the Web GUI, which is very convenient. And when I need to restore something, I can mount the Repo and just restore what I need. To test my Homelab Backup, I spun up a Linux VM, installed Docker + Kopia CLI to restore everything and all my containers were up and running again.
On my Windows Systems I run Kopia GUI which can connect to multiple Repositories. So my Desktops backup up to my NAS and to a Cloud storage at the moment. So they run basically 2 Backup jobs (which only take a few minutes each when run once a week). But there is also a feature that a Kopia Repo Server syncs its Repo to another Repo, so this could have been a solution too. That way your system creates a Backup only once and Kopia takes care of synchronizing the existing Repo to an additional place.