Thunderbird Community Forum

We been using Thunderbird for over 20 years and used MozBackup while it was supported and used it a few times when something got corrupted. To migrate from one PC to a new PC, we always used the "manual method" described below. As our files are 10.2 GB (mine) and 6.4 GBMB(wife's) in size, that goes like this:

If your profile folder is larger than 2 GB, you need to use your file manager and create a backup copy of your profile folder yourself.

1. To find your profile folder, you can use the Open profile folder link in the first step of the Export tool. You will see the contents of your profile folder in your file manager. The profile folder has a name like abc12defg.default-release. 2. Select and copy the entire content (content only, not the folder) of your profile folder. 3. Create an empty folder where you want to keep your backup, e.g. on a USB flash drive. You can choose a helpful folder name like Thunderbird_profile_backup_2022-06-28. 4. Paste the contents of your profile folder into your empty target folder.

On the larger 10.2 GB filetransfer, after launching TB on the new machine there was a lot of the spinning circle icon appearing / disappearing ... then it just stopped, gave it some time. Rebooted and all was fine with the world. Most accounts were accessible, one was not and I copied that from the desktop open on the same desk.

With the 6.4 GB file transfer to wife's laptop, it did not work ... tried again, no luck.

Tried my 10.2 GB file on wife's laptop and it worked fine. Can't understand why, after each attempt TB was uninstalled and everything TB related was removed from roaming folder. System was rebooted, searched for anything TB related, rebooted, installed TB, closed it, copied folder contents into profile folder on laptop, Rebooted and no go.

It will take the 10.2 GB file but not the 6.4 ... I'm confused.

Ho effettuato un backup con la procedura guidata ma il file è più grande di 2Gb. Ha creato il file zip ma quando provo a dezipparlo per importare le cartelle dice che potrebbe essere corrotto. C'è un modo per recuperare il profilo? Grazie