Thanks mate for the help. I have just opened the backup in it has two folders(etc and tmp). Those files are inside the etcmythtv/config.xml and mysql.txt, /etc/hostname and /etc/hosts). tmp has an empty folder mythbuntu bare.
Sorry but what is mythbuntu-bare and how to use it to backup the database? Does the database contain the recordings and livetv? I am only interested in backing up my channels and general settings and I don't know what is the simplest way to do so. Thank you.
Mythbuntu-bare is the backup and restore utility found in mythbuntu control center. I'll be pushing a fix for this later this afternoon to the mythbuntu repositories. If you have the mythbuntu-repos package you should get the update through normal updates