There's almost zero potential of damage from just the loader. Either it works or it doesn't.
If the loader works most any damage you do (by intentionally writing/erasing partitions) can be fixed.
If you want to play it safe (and you have plenty of space on your desktop hard drive) you can either save the entire flash as one 32 GB (or 64 or 128) file or save all the partitions individually.
You might consider strategies for safeguarding of data, which is a sort of different subject. Yes, you can rely on raw device/partition schemes, but it might be easier to save/restore a few GB of books rather than a 100 GB partition. Also, if you decide to replace your Note Air 2 with a Zircon 77.
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