[1] In 1993, performing with John Eliot Gardiner, Backes appeared as Barbarina in Mozart's Le nozze di Figaro at the Théâtre du Châtelet of Paris,[1] at the Royal Concertgebouw[2] in Amsterdam, and recorded it for Deutsche Grammophon Archiv.

She recorded with Gardiner also for Deutsche Grammophon Valetto in Monteverdi's L'incoronazione di Poppea and Papagena in Mozart's Zauberflöte.

[4] She recorded Samuel Scheidt: The Great Sacred Concertos in 2007 with conductor Roland Wilson, alongside Monika Mauch, Markus Brutscher, Werner Buchin, Wolf Matthias Friedrich, Wilfried Jochens and Harry van der Kamp.

[6] Performing with Passion of Cuivres in 2009, Backes sang La Comedie et la Mort at the Uckermärkische Musikwochen in the Uckermark[7] In 2012, Backes premiered Joseph Schuster's re-discovered opera Il Marito Indolente at the festival Regensburg Tage Alter Musik [de].

[8] She has sung with ensembles such as Deutsche Händelsolisten, Gabrieli Consort, Gesualdo Consort, Israel Camerata Orchestra, Musica Fiata and Ensemble Weser-Renaissance Bremen,[1] throughout Europe, including venues in Amsterdam, Aranjuez, Lisbon, London, Paris, Parma, Rome, Santiago de Compostela and York.