As a back server or back waiter in a restaurant, your responsibilities typically involve supporting the front-of-house team and ensuring smooth service for guests. 

1. Table Preparation: Setting up tables before guests arrive by arranging tableware, napkins, and condiments according to restaurant standards.

2. Assistance with Service: Assisting servers with delivering food and beverages to tables, refilling water glasses, and clearing empty plates and glasses throughout the meal.

3. Bread and Beverage Service: Bringing bread or other complimentary items to tables and refilling beverages such as water, coffee, or tea as needed.

4. Assisting with Guest Needs: Fulfilling guest requests, such as providing additional utensils, napkins, or special condiments, and assisting with any special accommodations.

5. Table Maintenance: Keeping tables clean and tidy throughout service, including wiping down surfaces, replacing soiled linens, and resetting tables for the next guests.

6. Supporting Front-of-House Staff: Providing support to servers, hosts/hostesses, and bartenders as needed to ensure efficient service and a positive guest experience.

7. Assisting with Service Flow: Monitoring the pace of service and assisting in coordinating the timing of food delivery to ensure that guests receive their meals promptly and simultaneously.

8. Communicating with Kitchen: Relaying guest orders and special requests to the kitchen staff accurately and promptly, and assisting in ensuring that orders are prepared correctly.

9. Assisting with Clean-Up: Helping to clean and reset the dining area at the end of service, including clearing tables, stacking chairs, and performing general cleaning tasks.

10. Following Safety and Hygiene Procedures: Adhering to food safety standards, maintaining cleanliness in work areas, and following proper sanitation protocols to ensure a safe and sanitary environment for guests and staff.

Overall, as a back server, your role is to support the front-of-house team in providing excellent service to guests, contributing to the overall efficiency and success of the restaurant's operations.