Some rules:
I would recommend Youth Pictures of Florence Henderson. They use cello too, although it's just one of plenty other sounds in their music. It's still great though, I love them.
https://youthpictures.bandcamp.com/
Also Neil on Impression where cello has a bit more important role (IMO).
Thanks! I didn't like much Youth due to the vocals and the amount of different sounds, it was too confusing for me. But Neil on Impression is fantastic. Like a noisier and more deep/bass Yndi Halda, which I love. Speciallt "Il faro e la balena".
You're welcome :-)
I've definitely heard more post-rock bands with cello, but can't remember right now.
I remembered another one that might fit in - Balmorhea. It's sometimes drifting a bit towards folk or acoustic music, sometimes somewhere else, but I still like it.
I recently went to God Is An Astronaut live show in Krakow. Their support was Ef - Swedish Post Rock band and they had a male cellist playing with them.