program for incremental backups tp FTP and scp servers written in python. often used for backups of (root) servers to FTP spaces in the datacentre.
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increase open file limits in /etc/security/limits.conf add:
root soft nofile 4096 root hard nofile 8192
re-login and check:
ulimit -Hn ulimit -Sn
http://www.cyberciti.biz/faq/linux-increase-the-maximum-number-of-open-files/