You are looking for a backyard turtle or tortoise. You've had suggestions to get a Sulcata. I have a Sulcata and this tortoise won't be right for you.
To start with, Sulcatas are a semi-desert African species. Their ideal temperature is 85F. Your Savannah, Georgia climate is too cool for a Sulcata to remain outside for 1/2 the year. They do not hibernate and will require heated indoor quarters from late fall, during winter and through spring months.
And they grow very, very big, very quickly. Within 5 years, your Sulcata will reach 20 to 50 lbs. They are also very aggressive and powerful diggers, pushing through every weak crevice and tunneling 2 to 3 feet deep down under any buried fence or wall.
You asked for a turtle or tortoise to keep year round in your backyard. A Sulcata will not meet your intentions. You should consider a box turtle instead. The species is native to your region. It will naturally hibernate 4 months or so under a 1' to 2' mound of leaves dumped into its enclosure.
Sulcatas main activities in life are eating, pounding away at any and every obstacle, eating and most of all, eating. Box turtles are less aggressive. In fact they are much more personable and will become bonded to you in time.
I suggest you Google "Box turtle care" and you will find a lot of info to help you make your choice.
Good luck to you, turtles and tortoises are great pets if you have the right ones for you.