Keep both.

cmd/internal/database/postgres/upgrade.go

@@ -42,6 +42,12 @@ func (db *Postgres) Upgrade() error {
 		return nil
 	}
 
+	// If this is a database directory, save actual postgres binaries for a later major upgrade
+	err := db.copyPostgresBinaries()
+	if err != nil {
+		return err
+	}
+
 	// Check if required commands are present
 	for _, command := range requiredCommands {
 		if ok := db.isCommandPresent(command); !ok {
@@ -78,7 +84,7 @@ func (db *Postgres) Upgrade() error {
 	// Check if old pg_config are present and match pgVersion
 	oldPostgresConfigCmd := path.Join(oldPostgresBinDir, postgresConfigCmd)
 	if ok := db.isCommandPresent(oldPostgresConfigCmd); !ok {
-		db.log.Infof("%q is not present, please make sure that at least one backup was taken with the old postgres version before running an upgrade, skipping upgrade", oldPostgresConfigCmd)
+		db.log.Infof("%q is not present, please make sure that at least one backup was taken with the old postgres version or restart the backup-restore-sidecar container with the old postgres version before running an upgrade, skipping upgrade", oldPostgresConfigCmd)
 		return nil
 	}