Not a function I have ever used...but as I understand it...it's a capture of DMX values at the time you press the button, logged by time and date.
So shapes are not stored; only the Pan and Tilt levels at the time of record. Only fixtures with an active dimmer channel are recorded.
When you recall a snapshot, the data is loaded into the programmer and you can then edit and save what you want.
That is relevant to the Pearl, I'm assuming it's the same for the Azure.
If you haven't already, download the manual and check..
HTH
Regards,
Andy