I'm the proud owner of the PE, and I just did a local backup, to my 8-gig micro SD card (over 5G available). So after mounting the external storage, I took a gander at its contents from my laptop (via Linux file manager Nautilus). Saw the folder "backups", which is completely empty, except for subfolder "/apps" (also empty).
Then I looked under folder ".edge" and could not find any subdirectory or file relating to a backup.
I'd love some help in figuring out what's up with this local backup thang. I'd actually like to delete the backed up data, as it's simply redundant being stored on the same card as the original data. I was just running a test, in order to learn. Thanks for anyone's attention!