Trying to figure out my multi-device backup solution, would appreciate some suggestion

So I have an UnRAID NAS that I am trying to figure out how to configure it as a localized backup solution for selected directories on several devices (i.e. looking for Phone Gallery backup, desktop documents backup, etc).

Once backed up to the NAS, I'm trying to figure out how I can then forward those backups to a cloud service (Ideally to a Google Drive since I have 2TB of access with my AI Pro subscription, and if-needed, I can bump that to 5TB for like $5/month).

I'm seeing various ways that I can backup my phone to my NAS, but I'm not sure how I would then forward those backups/changes to my Cloud storage environment. Additionally, I have a desktop and laptop that I would likewise like to backup/forward, along with my wife's iPhone (and possibly her Macbook).

I'm hopeful that there's some sort of all-in-one comprehensive solution out there, but I also know that if such a thing exists, it's unlikely to be free, and if it's not free, it's not likely to be a one-and-done purchase.

I've done some basic Googling as to solutions, but honestly it got a bit overwhelming and I figured asking here might be a good way to start.

Any help is appreciated!