Cannot prepare USB with rescue archive

I have CENTOS7, with mondo-3.2.2-1.rhel7.x86_64, mindi-3.0.2-1.rhel7.x86_64
and mindi-busybox-1.21.1-1.rhel7.x86_64.
Use the following command for prepare USB stick aith archive:
mondoarchive   -OU   -l GRUB  -s 8g -f /dev/sda -d /dev/sdb -G

After long run command failing with

---promptdialogYN---1--- Failed to create USB #1. Retry?

In logs I see:

DBG1: [Main] libmondo-archive.c->make_usb_fs#1532: WARNING - make_usb_fs
returned an error
DBG1: [Main] ../common/newt-specific.c->fatal_error#304: Fatal error
received - 'FAILED TO BACKUP'
DBG3: [Main] ../common/newt-specific.c->fatal_error#320: OK, I think I'm
the main PID.
DBG2: [Main] ../common/newt-specific.c->fatal_error#327: I'm going to do
some cleaning up now.
DBG4: [Main] ../common/newt-specific.c->fatal_error#328: killall mindi 2>
/dev/null

And USB stays mounted:

/dev/sdb1                7.5G  4.0K  7.5G   1% /tmp/mondo.tmp.hWngNU/usb

Any ideas why it fails?

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