To export to another Family Echo account, do the following:
-
On the family you want to back up, click on 'Download/export this family'.
-
Select 'FamilyScript'.
-
Click 'Download'.
-
Save the file which downloads (I recommend in 'My Documents' or equivalent'). Make sure you give it a name you can easily recognise.
-
Go to the account you want to export the tree to.
-
Go to 'My Account', and click on 'Create or import new family'.
-
Click on 'Import GEDCOM or FamilyScript'.
-
Click 'Browse' and find the tree's file where you saved it.
-
Click 'Import', and then 'Finish Import'.
-
Save the tree on the new account (use the normal 'Save' button).
-
You should then be able to use the tree as normal.
Note that you can also export using GEDCOM, but I think it might be a bit trickier.
I hope this helps!