Make certain that your FTP server supports the MLSD (Machine List Directory) or LIST commands. If the FTP server does not support these commands, the backup system cannot use the FTP server as a remote FTP server.
Unix-supported FTP servers, such as ProFTP and Pure-FTPd, support these commands.
For more information about these commands, read Wikipedia’s List of FTP commands documentation and itef.org’s RCF 3659 documentation.
Make certain that any hidden files (files that begin with a period(.)) on the FTP server have write permissions. The backup system can only prune data from files with these permissions.
We strongly recommend that you use Pure-FTPd or ProFTPD on remote FTP servers. Unexpected results may occur with some FTP server software.
If you use Pure-FTPd, ensure that the DisplayDotFiles yes statement resides in the /etc/pure-ftpd.conf file.
If you use ProFTPD, ensure that the Listsettings -a statement resides in the /etc/proftpd.conf file
If you use the Very Secure FTP daemon (vsftpd), ensure that you set the force_dot_files setting to yes in the /etc/vsftpd.conf file. For more information about vsftpd, read the vsftpd documentation.