I can't comment on MozBackup since I guess it's a Windows program whereas I use Linux. But the easiest way to create a backup is to copy your Thunderbird profile folder to an external drive: the profile folder includes all your emails, contacts, settings etc. More info here: https://support.mozilla.org/en-US/kb/profiles-tb If you want the process to occur automatically (e.g. weekly) then I'd look for a program that can be set to copy any folder or file to an external drive and just include your Thunderbird profile in that.