[Q] Nandroid: backup modem partition topic

Hi there,

I'm new to this forum, I have read a lot, thanx for the info for sa far!

My question is: I have a LG G2 an made a backup using Online Nandroid Backup (NORMAL BACKUP MODE).
When I browse the backup, there's a modem partition (3 MB).

If I try to make a backup using SELECTIVE BACKUP MODE, I can choose what partitions to backup. But there's no option to backup the modem partition.

How can I make a single nandroid backup of this partition?

(I tried to make a nandroid backup of the EFS partition, but that was empty)

Thank you in advance!

Regards Erik