Help...not sure if I am just brain dead right now lol but I am not sure about the best way to go about this

So I want to start using google drive for all of my project files
Right now I have an external drive and a NAS that I keep my project files on

One of my main clients (with multiple projects that I work on) uses google drive....up until now I selectively add project files to the shared folder based on their file needs...basically I typically keep the source files on my own hard drive and the project deliverable on the google drive

Now I want to simplify everything and put all project files on the google drive and back up everything in a seamless way

My biggest concern is that a few months ago someone from that organization deleted all of the files from the shared drive....luckily they were able to be retrieved but if all my project files had been on there I would have had a heart attack

I know you can sync google drive to a hard drive but my concern is the two way sync....like in the previous situation....i don't believe syncing the google drive to my hard drive would have helped me retrieve the files since in the sync process all of the file son my hard drive would have been deleted right?

So what is the solution here....I basically want to make sure regardless of what someone in the organization does with the shared files .... I will always have a back up in an automated way.

the key to happiness is not being rich;
it's doing something arduous and
creating something of value and then
being able to reflect on the fruits of your labor