Terracotta tile is, thankfully, quite durable. Make sure that you don't have any standing water on the tile and fill in the grout if it begins to chip. Otherwise, just mop every once in a while to keep it clean.
There are protective coatings for tiles which you can purchase at many hardware stores. The best thing to do is avoid scratching the tile at any costs. Get protective pads for the legs of chairs.
there are several commercial products designed to care for tile such as Aldon. They have a complete line of products and are high in quality. terracotta tile is a big investment so do not scrimp on cleaning.
