Logged In: YES 
user_id=752496

This fixes the problem: the original file metadata
(permisions, etc) stays unchanged.

The issue with the metadata of the bak file is none: the new
file has the user defaults permissions, group and owner. In
the previous version, the original file left with those
defaults permissions, so security is not getting worse.

The only left issue is, if the user wants to recover the
data from the bak file, he would need to change its metadata
(this is minor, if something goes wrong and the bak is
needed, it's likely that the user will need a manual approach).

My primary concern is that I don't want to commit the
changes now that we're beta without testing the changes in
other platforms (however, I'll ask this on python-dev).