I've added an external battery backup real time clock (Adafruit's 
Chronodot) via I2C to my BBB. I've successfully managed to add it as a 
module in Debian 8.2 using Adafruit guide 
<https://learn.adafruit.com/adding-a-real-time-clock-to-beaglebone-black/set-rtc-time>,
 
and it is now accessible via hwclock using the override command *hwclock -r 
-f /dev/rtc1*.

Reading around the web it states that the system time, synced with NTP, can 
automatically write the current system time every 11 minutes to the 
hwclock. The default hwclock is /dev/rtc0 which isn't backed up with a 
battery. Is it possible to change the default hwclock to always be 
/dev/rtc1? Or will hwclock automatically update both /dev/rtc0 and 
/dev/rtc1 with the system time?

Thank you for your time.  

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