The Translator stores form instances (forms that an end-user is interacting with) in memory within its form cache and on disk within the Shared File Cache.
The Translator’s form cache can store a specific number of form instances in memory. When this number is exceeded (for example, when many users are simultaneously completing forms), then some form instances are saved to the Shared File Cache.
The Shared File Cache is shared between multiple instances of the Translator, ensuring high availability. If one Translator instance or server fails, another instance or server can continue the user session by accessing the data from the Shared File Cache.
Parent topic: Webform Server system components