sauf à

except to

→ sauf
phrase Rare #39,516
except to Formal; often used in legal or written French, especially before an infinitive, with the sense of 'unless' or 'except if'.
FR: Sauf à changer d'avis, nous partirons demain.
EN: Unless we change our minds, we'll leave tomorrow.

Ils ne pensent à rien d'autre, sauf à consommer.

They don't think about anything other than consuming.

— La Bande à Baader (2008)

Tom ne l'avait dit à personne sauf à Mary.

Tom hadn't told anyone except Mary.

Un homme égoïste ne pense à rien sauf à ses propres sentiments.

A selfish man thinks of nothing except his own feelings.