I have attached this app from Playstore for Nandroid backup with/without CWM/TWRP but for us on KASTY's  ROM we are are likely to be without CWM/TWRP. So this is the best thing for (actually any Android devices) M9Pro because I tried it on my previous devices  (rooted) without success but it did wonderfully on M9Pro.
But a word of advise after it finished the backup and you exit the app please do not switch off your device because it is ZIPPING your backup and doing an MD5 signing of the zip in the background. You can check this by swiping down on the task bar and seeing the progress of the zipping.
So be patient, even much more so if you are asking it to do a cloud backup the whole process of uploading to the cloud ALL in ALL it will take up a good 20 to 30 minutes from start to finish (finished uploading to the cloud).

It can be used on other Android devices thats why it is on the Playstore but whether the device is supported or not thats another thing, when it first starts up it will check for compatibility and download the necessary script (this is where a lot of devices fail, it might corrupt some files in the system).

But rest assured for PiPo M9Pro is A-OK.

It has a funny app name but the app is NOT, it is seriously powerful.