Signal Backups on µSD card

Hello to all sailors,
Is there a way to force the Android App Signal to force it to make backups on the µSD card and not in the internal memory ?
I’m not a developper, but is there a script that could do this ?
At this time i am on 3.3 (i am not an Early Adopter).
Thanks a lot

I tried to do the same way for gPodder.

But system answered that the operation is not permitted :frowning:
No solution except the “manual” way ? I’m now with Sailfish OS 3.4 on my XA2 h3113.
Thanks a lot