[Replicant] backup stock ROM without root

[Fil Lupin]

Hello,
up to this day, I always rooted my phone and installed replicant as a first step, but I encountered a strange behaviour after installation on a GT-I9100 which persuades me to do a full backup before modifying anything.

Since I failed to use "adb shell" on my device which is non-rooted, do you know any way to make some backup of a stock ROM?
Regards,

- Fil Lupin.
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