Snapshot from Backup

i would go with a macro that is calling the Snapshot.
In the macro you can tell wich device should execute it. 

This is wonderful news, Thank you.   

However, this leads me to another question:   How do you choose a device in a macro?

A short look into the manual will maybe clear things a bit up

Manual-Page 470, PDF Page 486 (Manual v3.2.1)

{Target Device} - A macro can have a Target Device assigned to it. This allows a cue to execute a macro only on a certain console. Macros 471 • The Target Device can be a device name or User ID. These are assigned to a macro in the Macro Display by using the {Target} softkey and either selecting {Device} and {User}. Pressing {Target} will also display a list of connected devices and additional target options.

A short look into the manual will maybe clear things a bit up

Manual-Page 470, PDF Page 486 (Manual v3.2.1)

{Target Device} - A macro can have a Target Device assigned to it. This allows a cue to execute a macro only on a certain console. Macros 471 • The Target Device can be a device name or User ID. These are assigned to a macro in the Macro Display by using the {Target} softkey and either selecting {Device} and {User}. Pressing {Target} will also display a list of connected devices and additional target options.

Thanks again for the additional details.  It's awesome