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I found some hidden backup files eating up my storage space.
Not sure if this was a glitch on my N4, or if others may see this as well, but my sd card storage was just about completely full the other day, even though I had deleted a bunch of extra stuff as well as some unused apps. The problem I ran into surfaced after I cut and pasted some twrp and cwm nandroid backups I had made from the phones sd card to my pc. After the backups had been removed and the directories were showing up as empty when the phone was plugged into my pc (using windows file explorer), the sd card storage was still near full. I launched RootExplorer on the phone and found huge backup files for both twrp and cwm still there, but in a different location. They were located in the /data/media/twrp and /data/media/clockworkmod dirs, respectively. Whether this /data/media... dir is what the phone actually views as your virtual sd card or not, these backup files should not have been there after I removed them from the sd card. After deleting them, I've now got an extra 6 gig of free space (your mileage may very depending on what backups have been performed).