diff --git a/main.go b/main.go
index 90c80f0..0349f5a 100644
--- a/main.go
+++ b/main.go
@@ -34,10 +34,9 @@ type ProjectRedisConfig struct {
 }
 
 type ProjectOffloadConfig struct {
-	WatermarkHigh   int64 `json:"high"`
-	WatermarkMiddle int64 `json:"middle"`
-	WatermarkLow    int64 `json:"low"`
-	BatchSize       int64 `json:"batchsize"`
+	WatermarkHigh int64 `json:"high"`
+	WatermarkLow  int64 `json:"low"`
+	BatchSize     int64 `json:"batchsize"`
 }
 
 type ProjectConfig struct {
@@ -48,7 +47,6 @@ type ProjectConfig struct {
 type Offloader struct {
 	RedisClient   *redis.Client
 	ProjectConfig ProjectConfig
-	OffloadConfig ProjectOffloadConfig
 	Context       context.Context
 	Cancel        context.CancelFunc
 	Done          chan bool
@@ -72,32 +70,30 @@ func (that *Offloader) RedisConfigDiffers(new *ProjectRedisConfig) bool {
 }
 
 func (that *Offloader) OffloadConfigDiffers(new ProjectOffloadConfig) bool {
-	return that.OffloadConfig.WatermarkHigh != new.WatermarkHigh || that.OffloadConfig.WatermarkMiddle != new.WatermarkMiddle || that.OffloadConfig.WatermarkLow != new.WatermarkLow || that.OffloadConfig.BatchSize != new.BatchSize
+	return that.ProjectConfig.OffloadConfig.WatermarkHigh != new.WatermarkHigh || that.ProjectConfig.OffloadConfig.WatermarkLow != new.WatermarkLow || that.ProjectConfig.OffloadConfig.BatchSize != new.BatchSize
 }
 
-func (that *Offloader) RefreshQueues() {
+func (that *Offloader) RefreshQueues() error {
 	pipe := that.RedisClient.Pipeline()
 	prioritiesCmdRes := pipe.ZRange(that.Context, fmt.Sprintf("%s:priorities", that.Name), 0, -1)
 	filtersCmdRes := pipe.SMembers(that.Context, fmt.Sprintf("%s:filters", that.Name))
 	_, err := pipe.Exec(that.Context)
 	if err != nil {
-		log.Printf("unable to refresh queues for offloader %s: %s", that.Name, err)
-		return
+		return err
 	}
 	priorities, err := prioritiesCmdRes.Result()
 	if err != nil {
-		log.Printf("unable to refresh queues for offloader %s: %s", that.Name, err)
-		return
+		return err
 	}
 	filters, err := filtersCmdRes.Result()
 	if err != nil {
-		log.Printf("unable to refresh queues for offloader %s: %s", that.Name, err)
-		return
+		return err
 	}
 	setQueueMap := map[string]string{
 		"todo":           "todo",
 		"todo:secondary": "todo:secondary",
 		"todo:redo":      "todo:redo",
+		"todo:backfeed":  "todo:backfeed",
 		"done":           "done",
 		"unretrievable":  "unretrievable",
 	}
@@ -112,7 +108,11 @@ func (that *Offloader) RefreshQueues() {
 		needQueueMap[queueName] = true
 		if _, has := that.Queues[queueName]; !has {
 			log.Printf("opening queue %s for %s:%s", queueName, that.Name, setName)
-			that.Queues[queueName] = dq.New(fmt.Sprintf("%s:%s", that.Name, that.CleanName(queueName)), dataDir, 128*1024*1024, 0, 128*1024*1024, 1_000_000, 5*time.Second, l)
+			queue := dq.New(fmt.Sprintf("%s:%s", that.Name, that.CleanName(queueName)), dataDir, 128*1024*1024, 0, 128*1024*1024, 1_000_000, 5*time.Second, l)
+			if queue == nil {
+				return fmt.Errorf("unable to open disk queue %s:%s (dq.New()==nil)", that.Name, that.CleanName(queueName))
+			}
+			that.Queues[queueName] = queue
 		}
 		that.Sets[setName] = queueName
 	}
@@ -122,6 +122,7 @@ func (that *Offloader) RefreshQueues() {
 			delete(that.Queues, k)
 		}
 	}
+	return nil
 }
 
 func (that *Offloader) CloseQueues() {
@@ -163,23 +164,26 @@ func (that *Offloader) Do() {
 	refreshTicker := time.NewTicker(5 * time.Minute)
 	defer refreshTicker.Stop()
 
-	that.RefreshQueues()
+	if err := that.RefreshQueues(); err != nil {
+		log.Printf("unable to refresh queues for %s: %s", that.Name, err)
+		return
+	}
 	that.UpdateStats()
 
 	skipSleepChan := make(chan bool, 1)
 	defer close(skipSleepChan)
 
-	watermarkHigh := that.OffloadConfig.WatermarkHigh
+	watermarkHigh := that.ProjectConfig.OffloadConfig.WatermarkHigh
 	if watermarkHigh == 0 {
 		watermarkHigh = DefaultWatermarkHigh
 	}
 
-	watermarkLow := that.OffloadConfig.WatermarkLow
+	watermarkLow := that.ProjectConfig.OffloadConfig.WatermarkLow
 	if watermarkLow == 0 {
 		watermarkLow = DefaultWatermarkLow
 	}
 
-	batchSize := that.OffloadConfig.BatchSize
+	batchSize := that.ProjectConfig.OffloadConfig.BatchSize
 	if batchSize == 0 {
 		batchSize = DefaultBatchSize
 	}
@@ -334,7 +338,10 @@ func (that *Offloader) Do() {
 		case <-that.Context.Done():
 			return
 		case <-refreshTicker.C:
-			that.RefreshQueues()
+			if err := that.RefreshQueues(); err != nil {
+				log.Printf("unable to refresh queues for %s: %s", that.Name, err)
+				return
+			}
 			that.UpdateStats()
 		case <-ticker.C:
 			that.UpdateStats()
@@ -449,6 +456,7 @@ func main() {
 	sc := make(chan os.Signal, 1)
 	signal.Notify(sc, syscall.SIGINT, syscall.SIGTERM, os.Interrupt, os.Kill)
 	ticker := time.NewTicker(1 * time.Minute)
+	defer StopProjects()
 	for {
 		RefreshProjects(mainClient)
 		select {