[Android Apps and Games] Lei.Diya.Adolf:
I tested it on the 23th,on my device LGG3 D857,cm12.1-20151204-mysteryjeans-d856,5.1.1,kernel:Neubula 12.5_LPd856

And making backup successfully,this is the log:

Online Nandroid v9.52
Started at Mon May 23 13:18:46 CST 2016
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Run with options: --advanced d --twrp --utc --storage /sdcard -me -ce -pd -r

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Busybox: BusyBox v1.20.2-linusyang (2012-10-15 16:24:24 CST) multi-call binary.

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File System Layout:
rootfs on / type rootfs (rw,seclabel,nosuid,nodev,noatime,nodiratime)
tmpfs on /dev type tmpfs (rw,seclabel,nosuid,noatime,nodiratime,mode=755)
tmpfs on /dev type tmpfs (rw,seclabel,nosuid,noatime,nodiratime,mode=755)
devpts on /dev/pts type devpts (rw,seclabel,noatime,nodiratime,mode=600)
proc on /proc type proc (rw,nosuid,nodev,noatime,nodiratime)
sysfs on /sys type sysfs (rw,seclabel,nosuid,nodev,noatime,nodiratime)
selinuxfs on /sys/fs/selinux type selinuxfs (rw,noatime,nodiratime)
debugfs on /sys/kernel/debug type debugfs (rw,seclabel,nosuid,nodev,noatime,nodiratime)
none on /acct type cgroup (rw,noatime,nodiratime,cpuacct)
none on /sys/fs/cgroup type tmpfs (rw,seclabel,noatime,nodiratime,mode=750,gid=1000)
tmpfs on /mnt/asec type tmpfs (rw,seclabel,noatime,nodiratime,mode=755,gid=1000)
tmpfs on /mnt/obb type tmpfs (rw,seclabel,noatime,nodiratime,mode=755,gid=1000)
none on /dev/cpuctl type cgroup (rw,noatime,nodiratime,cpu)
none on /sys/fs/cgroup/bfqio type cgroup (rw,noatime,nodiratime,bfqio)
/dev/block/platform/msm_sdcc.1/by-name/system on /system type ext4 (ro,seclabel,noatime,nodiratime,data=ordered)
/dev/block/platform/msm_sdcc.1/by-name/userdata on /data type ext4 (rw,seclabel,nosuid,nodev,noatime,nodiratime,noauto_da_alloc,resuid=1000,errors=continue,data=ordered)
/dev/block/platform/msm_sdcc.1/by-name/cache on /cache type ext4 (rw,seclabel,nosuid,nodev,noatime,nodiratime,data=ordered)
/dev/block/platform/msm_sdcc.1/by-name/persist on /persist type ext4 (rw,seclabel,nosuid,nodev,noatime,nodiratime,nomblk_io_submit,nodelalloc,errors=panic,data=ordered)
/dev/block/platform/msm_sdcc.1/by-name/modem on /firmware type vfat (ro,context=u:object_r:firmware_file:s0,noatime,nodiratime,uid=1000,gid=1026,fmask=0337,dmask=0227,codepage=cp437,iocharset=iso8859-1,shortname=lower,errors=remount-ro)
/dev/block/platform/msm_sdcc.1/by-name/sns on /sns type ext4 (rw,seclabel,nosuid,nodev,noatime,nodiratime,noauto_da_alloc,errors=continue,data=ordered)
/dev/block/platform/msm_sdcc.1/by-name/drm on /persist-lg type ext4 (rw,seclabel,nosuid,nodev,noatime,nodiratime,noauto_da_alloc,errors=continue,data=ordered)
/dev/block/platform/msm_sdcc.1/by-name/mpt on /mpt type ext4 (rw,seclabel,nosuid,nodev,noatime,nodiratime,noauto_da_alloc,errors=continue,data=ordered)
/dev/fuse on /mnt/shell/emulated type fuse (rw,nosuid,nodev,noatime,nodiratime,user_id=1023,group_id=1023,default_permissions,allow_other)
/dev/block/vold/179:65 on /mnt/media_rw/sdcard1 type fuseblk (rw,dirsync,nosuid,nodev,noexec,noatime,nodiratime,user_id=0,group_id=0,allow_other,blksize=4096)
/dev/block/vold/179:65 on /mnt/secure/asec type fuseblk (rw,dirsync,nosuid,nodev,noexec,noatime,nodiratime,user_id=0,group_id=0,allow_other,blksize=4096)
/dev/fuse on /storage/sdcard1 type fuse (rw,nosuid,nodev,noexec,noatime,nodiratime,user_id=1023,group_id=1023,default_permissions,allow_other)
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Device Details:
ro.product.brand=lge
ro.product.name=g3_open_cis
ro.product.board=MSM8974
ro.product.cpu.abi=armeabi-v7a
ro.product.cpu.abi2=armeabi
ro.product.cpu.abilist=armeabi-v7a,armeabi
ro.product.cpu.abilist32=armeabi-v7a,armeabi
ro.product.cpu.abilist64=
ro.product.manufacturer=LGE
ro.product.model=LG-D856
ro.product.device=d856
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Recovery:
Generic recovery.
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Language File:
Not found!
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05:18:48 Using busybox from: /data/data/com.h3r3t1c.onnandbup/files/busybox
05:18:48 Checking for root permissions...
05:18:48 Root permissions acquired!
05:18:48 Analysing battery level...
05:18:48 Sufficient battery available!
05:18:48 Checking version of BusyBox installed...
05:18:48 BusyBox version 1.20 or above installed!
05:18:48 Searching for SD card...
05:18:48 Alternate storage media provided!
05:18:48 TWRP backup mode selected at run time!
05:18:48 TWRP compression enabled at run time!
05:18:48 Advanced backup mode selected at run time!
05:18:48 Checking for required tools...
05:18:49 All required tools available!
05:18:49 Checking disk space...
05:18:49 SD Card Free Space: 3613 MB
05:18:49 Required Space: 3508 MB
05:18:49 Necessary disk space available!
05:18:49 Detecting mountpoints to exclude...
05:18:49 Backing up to /sdcard/TWRP/BACKUPS/LGD8571778a758/2016-05-23--05-18-48
05:18:49 Backing up the old backup for replace operation...\c
05:18:51 Consider installing patch file for your device, for a complete nandroid!
05:18:51 Backing up /data...\c
05:32:52 Replacing old backup with new backup...\c
05:32:54 Generating md5sum for data.ext4.win...\c
05:33:27 Online Nandroid Backup Completed in 14 minutes 39 seconds!
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Files Backed-up:
"-rw-rw---- 1 2021930824 May 23 05:32 data.ext4.win
-rw-rw---- 1 48 May 23 05:33 data.ext4.win.md5"

I restored it later by twrp_3.0.2_UNOFFICIAL_d856 successfully,at least final effort was successful,no any problem.The only thing strange is the total size showed '0MB':confused:

It is really useful as you can still include your new data into the backup though the process have started.

Sorry for my broken English(Maybe?…