[Q] Backing up ROM on LG LS 620 Realm

Hello.
I have an LG LS620 Realm that I have rooted using towelroot and have verified that I have root access.
I am trying to backup my current ROM before I do anything so I have something to go back to and when I use any of the programs that everyone recommends for ROM management the phone boots into the Recovery screen and I get the following screen

Android system recovery <3e>
KOT49I.LS620ZV3

E:missing bitmap stage_empty
(code -1)
E:missing bitmap stage_fill
(code -1)
Formatting
manual select menu

From here it gives me the following options
Reboot system now
apply update from external sd card
apply update from cache
apply update from ADB
wipe data/factory reset
wipe cache partition

Im trying to make a ROM backup and have tried it using ROM toolbox, Nandroid Manager, TWRP Manager, Clockworkmod ROM manager

any help getting this ROM backed up would be appreciated.
Thanks
Robert

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