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diff --git a/server/runtime/org.argeo.server.core/src/main/java/org/argeo/server/backup/BackupPurge.java b/server/runtime/org.argeo.server.core/src/main/java/org/argeo/server/backup/BackupPurge.java
new file mode 100644
index 000000000..cc5badc50
--- /dev/null
+++ b/server/runtime/org.argeo.server.core/src/main/java/org/argeo/server/backup/BackupPurge.java
@@ -0,0 +1,18 @@
+package org.argeo.server.backup;
+
+import java.text.DateFormat;
+
+import org.apache.commons.vfs.FileSystemManager;
+import org.apache.commons.vfs.FileSystemOptions;
+
+/** Purges previous backups */
+public interface BackupPurge {
+	/**
+	 * Purge the backups identified by these arguments. Although these are the
+	 * same fields as a {@link BackupContext} we don't pass it as argument since
+	 * we want to use this interface to purge remote backups as well (that is,
+	 * with a different base), or outside the scope of a running backup.
+	 */
+	public void purge(FileSystemManager fileSystemManager, String base,
+			String name, DateFormat dateFormat, FileSystemOptions opts);
+}