Cannot locate recovery image
Until Android version 4.4.2 the CWM backups are stored in /data/media/clockworkmod/backup  Reason for this as per the Reddit Post (see source below)


  In Android 4.2, backups are placed in a secure directory, inaccessible to other apps


Whether it is TWRP / CWM / Philz recovery, clearing "internal storage", does not wipe this folder, unless explicitly cleared, hence back ups remain safe

You should be able to view the backup by any root enabled file explorer

This backup can be transferred to 


External SD card by using a file explorer (to save space on internal SD)
Laptop using  adb pull /data/media/clockworkmod/backup


Source 

XDA Thread: CWM Recovery restoring nandroid backup

Reddit Post: Transferring CWM backups to my PC?

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