3.- By File component you can save text in format CSV as a backup in an external file, example: /backuptinydb.txt

4.- You can edit external file, and then load in TinyDB.

5.- ”Delete characters from text”, again in this extension.

 (https://groups.google.com/forum/#!category-topic/mitappinventortest/app-inventor-extensions/qN6fuQPNVUQ)

 6.- Remember, when you put several TinyDB in your app (TinyDB1, TinyDB2, TinyDB3,…) all are the same file.

 Regards.

 Juan Antonio Villalpando