Backup Thunderbird Email Accounts

There are two ways to backup: Use a backup utility or do it yourself manually. For automatic backup, you can use MozBackup. MozBackup is a free utility written by Pavel Cvrcek that will automatically backup Firefox and Thunderbird as well as Netscape and the full Mozilla suite.
Manual Thunderbird Backup in only 2 Steps

Manual backup is very easy. And you are in full control of the process, that is what why recommend it. Backing up Thunderbird manually is as simple as copying their respective profile folders to another location. If you do that, you’ll have a full backup with all your setting and personal data saved.
1. Find the profile Thunderbird folder

They are located in different places for different versions of Windows and they may be assigned random file names that make them difficult to recognize.

On Windows 2000/XP/2003/Vista machines the location for your Thunderbird profile is:
C:\Documents and Settings\Administrator\Application Data\Thunderbird\Profiles\0cn5gx8z.default\

On Windows 9x/Me PCs it can usually be found at:
C:\Windows\Application Data\Thunderbird\Profiles\0cn5gx8z.default\

On Windows 7:
C:\Users\Administrator\AppData\Roaming\Thunderbird\Profiles\0cn5gx8z.default\

2. Copy the Thunderbird profile folder - Done!

To back these up just copy the profiles folder(look like: 0cn5gx8z.default) to another location, drive, CD or USB stick. It's as simple as that! You can do it manually but you cab also use Windows Scheduler to do the job automatically with a batch file (for experts).