Locate the Thunderbird Profile
You may never need it to restore it, but it is a good idea to make a backup profile from time to time, just in case. When you want to restore your Mozilla Thunderbird data from a backup copy, the process is simple. Before you can replace it with a backup profile, you need to find the existing profile on your Windows or Mac computer. To locate it: If you have never moved your profile folder, you can opt to go directly to the profile folder in Windows 10, 8.1, 7, and Vista using this path: C:\Users\AppData\Roaming\Thunderbird\Profiles\ The direct path on a Mac running OS X or macOS is ~/Library/Thunderbird/Profiles// However you get there, you’ll see a folder with a six-random-character name and a .default extension.
Restore a Mozilla Thunderbird Profile From a Backup Copy
To restore your Mozilla Thunderbird Profile from a backup:
