Under File > Export you can select to export all your data as .olm file. This file can be used as backup or to move your data into a new Identity. Do you get “Done” at the end or do you get “one or more items failed to export”? If you do not get “Done”, all your data was not exported.
If you are using the .olm file to create a new identity, I suggest you delete your . . .
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