Backup / Restore Applications

Hi,

below Options / Settings / System Settings are the settings for “Number of automatic application copies” = 10.

Question 1: According to what criteria determines sc when a copy is necessary?

Below File / Restore Application can i choose the required application(s) to restore. But i see not all apps in “Choose the application”.

Question 2: When shows sc all apps?

Thanks for your help and explanation.