I realy like the world setting of this species.
Poor guys surviving on a home planet cannibalized by outer spacers.
Somehow getting by day by day with what ever is left of it's natural resources and in their eyes supernatural artifacts the invaders left behind in their ruins.
If written well, it would make for a good book, comic or movie.

Thank you very much!

It really is a fun setting, I stopped doing so much with them as time went on but I'd love to continue exploring their world in the future. You're exactly right about their way of life--while the offworlders mined and exploited them and their world with little care, in some ways, what was left behind may have helped them survive once the invaders left.
I have actually considered exploring the idea of some of them regarding the abandoned technology as supernatural in nature as well, perhaps feeling an almost religious reverence toward still-operational computer terminals displaying maps or outfitted with hologram projectors casting ghostly images of structures and beings, or even some of them having set up something akin to a cargo cult, acting out what they know of how the offworlders operated their supply depots and landing bays, hoping to summon back the starships full of this seemingly miraculous technology and bountiful resources. Processed foods in containers that keep it from spoiling, powerful weapons capable of casting projectiles or even energy across vast distances, lights that shine brighter than any torch without any sort of flame, blades forged from hard metals that never seem to go dull, handheld devices that let them speak to each other even when they're miles apart or seemingly draw sounds and music from the air itself, and all manner of foreign materials useful for crafting tools and weapons and clothing.
It's also really fun to imagine what a more primitive creature would interpret things like canned food, firearms and blasters, flashlights and lamps, modern steel knives and machetes and hatchets, walkie-talkies and radios, and modern materials like synthetic fabrics, plastic, metal and glass.

I'm glad you're interested in seeing more!

Actually I hope, that there will be more. I would like to hear, what the planet was like, before it was turned into a run down place. And how the people on the planet live nowadays since the planet is run down and in the name of profit squezzed out like an orange. I would bet, that trees are extinct now.

Clark's 3rd law:
Any sufficiently advanced technology is indistinguishable from magic.

Their planet was never that beautiful to begin with, with much of the main continent being fairly dry and desert-like. The landscape is rugged and rocky in some parts, and dry and sandy in others, with sparse vegetation. There are some forests further north and south, and on some of the smaller islands that dot the rest of the planet's surface, but most of what isn't ocean or ice cap is some sort of desert or badlands.
This actually gave the Ridgebacks a bit of an advantage, as they evolved to survive and thrive under these conditions, while most offworld races weren't used to it--the Ridgebacks often avoided confrontation by simply retreating into the wasteland and the offworlders wouldn't bother to pursue very far, and when they did decide to fight back to repel the alien invaders, they simply used hit-and-run tactics, quickly attacking transports or sabotaging structures before scattering, forcing any pursuing colonists to split up into smaller groups--which were in turn easily picked off or driven back because they didn't know the area or how to function effectively in it.

Eventually, the whole operation just got too costly. Terminus is far from any of the major interplanetary trade hubs, the most valuable resources were extracted and what was left wasn't worth the effort or expense of gathering or transporting, and the natives were consistently making life difficult by sabotaging machinery and structures. The majority of the offworlders left, not even bothering to load most of their machinery and supplies onto the transport ships because it just wasn't worth the time, hassle, or additional fuel costs. Some mining colonies still operate, and some offworlders were left behind and still try to make a life on Terminus, but they are fairly few in number.

A lot of the art for them focuses on this time after the offworlders withdrew, but I should probably explore the rest of the planet's history at some point as well.

Oh, so Terminus has always been a desserted planet? And I had thought it was turned into one. All in all I had assumed the history to be totally different, but since it is your world, you make the story.