My machine also has the SD card. I'm able to connect the SD card to my computer and read it with the SleepyHead computer program.

I do this every few months or when I start to have issues.

The mask fit has to be very bad for the machine itself to alert me.

I run the SleepyHead 1.0.0-beta-2 version on Windows 10. It is free and Open Source; it can be downloaded from here: SleepyHead CPAP Review Software