If you are getting Failed to zip files. pclZip error (-10): .Unable to find End of Central Dir Record signature error, please check the following.
- Check if your WP server has enough disk space.
- Check if the write permission to the wp-content/infinitewp/backups folder is 666 or 777 (writable by php)
- Check if there is enough memory to backup large sites. Try excluding some directories using exclude option while backing up.