What type of memory is preserved when performing an image backup?

The correct answer emphasizes the capability of SRAM (Static Random Access Memory) and F-ROM (Flash-Read Only Memory) to retain important configuration and operational data when an image backup is performed.

When creating an image backup in a CNC control system, preserving information in SRAM is crucial as it typically contains transient data that the system requires for immediate operations, including program files and machine parameters. Additionally, F-ROM is significant because it retains software, firmware, and other essential data that should not be lost during system operations or power outages.

Together, these two types of memory ensure that both volatile data and critical software information are saved. This comprehensive approach safeguards all necessary elements of the control system, allowing for a full restoration when needed.

In contrast, focusing on only SRAM would omit the significance of the persistent data stored in F-ROM, and solely relying on F-ROM neglects the necessity of real-time operational data typically stored in SRAM. Furthermore, EEPROM (Electrically Erasable Programmable Read-Only Memory) is not included in the correct answer, as it serves a different function and may not always be relevant in image backups, depending on the system architecture.