I have looked for something similar. There are a number of spaces where FOSS project lists are maintained, but they are often focused on a singular topics like ‘privacy’ or something akin, and they aren’t often parts of larger lists that can be sorted based on the conditions you mentioned above.
The closest thing, if you are interested in other possible tools that might help: Alternative.to, a crowdsourced software searching tool, which has a means of filtering to show only, say, open source projects, or sort by tags that denote stacks used, languages used, etc. (see screenshot of tags I added). It has been useful enough for my own needs when looking for what you’ve been looking for.
Either way, best of luck! I haven’t been able to find something yet, myself.
What’s your hypervisor manager? Or are you just bare metal?
For VMWare and Proxmox both, I would recommend the community edition of Veeam. It can handle up to 10 VMs for free.
If you’ve got the funds as a small-to-large business, Veeam’s first paid tier, on a yearly basis, is a solid option to backup even more.
Caveat emptor if you buy a license (or not): Veeam runs on Windows only. I have used, like, a single internal network Windows VM dedicated just to Veeam before. It has an easy to pick up UX after a little research, and the UI is clean.
Bacula is deprecated, unfortunately.