Need some tips on cloud storage on Mac

Hey all! Im a noob in all of this and need some advice to understand better. I always had backblaze computer backup product and it worked fine plus was super easy but wanted a cheaper solution. So recently I signed up for B2 Backblaze and installed Mountain duck on my machine and started backing up.

Now my mac created the cloud storage 'bucket' folder on the sidebar and I have been syncing and copying files from my local hard drive to the cloud storage manually. Should I directly work and save files inside the bucket folder folder and work from it? What happens if I dont have an internet connection? Im a bit confused here. thanks