How you make a backup (on a memory stick) of the address book please?

I can't find how to do a .csv file as I used to do with Outlook Express. I tried to get the info online, but am still confused!
All advice gratefully received, ideally to make a copy of so that in case of computer crash I'll still be able to access a (long!) list of contacts?
Thanks in advance, Richard

Opens the address book
The menu bar, select Tools-export
Name the file, select the file type and choose save destination

Tags: Thunderbird

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