You don't say what operating system you are using and what version of CWM.
Edit: Your other post says you are now running CM11 and CWM v6048. That is why it is different, you just installed a new CWM. v6048 uses a different path for backup. I don't know how to fix it for you with ROM Manager.
Sent from my SCH-i705 using XDA Premium HD app
See my Nook Color Tips Thread here
and my Nook Color EMMC Partition Repair Thread here
and my Nook Color Updated CM SD Installation Instructions here
and my Nook HD/HD+ stock tips thread here
and my Nook HD/HD+ CWM Root Tools thread here
e.mote's Nook HD/HD+ Dummies Guide for installing CM10.1/CM10.2/CM11 here