Backup before M Preview

T0mm450

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Sep 1, 2015
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Hi there!
I'm going to update my Nexus 5 (root, custom recovery) from Lollipop to M and I have a few questions :
1)When the final version comes out, will I be able to upgrade my phone with an OTA or with the flashing of the new factory system image?
2) Is root possible in this Developer preview?
3)This is the most important : what's the best way to backup my data before updating? Can I do a nandroid, update, and then restore it? If not, what are the other alternatives? I'm talking about apps+data and user data (pictures, videos, music, documents). Is ADB backup from Nexus Root Toolkit a good option?
Thank you for your help!

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