Comment 7 for bug 120018

vi is able to make a backup copy of whatever 755 file i try to edit in my curlftpfs mounted directory (i.e. original: somefile.php, backup: somefile.php~), but editing it gives me this error in vi:
"test.php" E507: Close error for backup file (add ! to override)

I mounted like this:
sudo curlftpfs -o allow_other ftp://user:<email address hidden> /home/steve/mydirectory/

and I have tried many other variations of mounting the directory with curlftpfs with no success. Apparently the IT guys were able to get it working on whatever machines they were using:

"....Actually they created a "test" FTP subuser for your account and had no problems to edit the classes.php file over curlftpfs....."

hope this was helpful