diff --git a/cmd/restic/cmd_backup.go b/cmd/restic/cmd_backup.go
index 0921a8390..54e23b0e6 100644
--- a/cmd/restic/cmd_backup.go
+++ b/cmd/restic/cmd_backup.go
@@ -217,16 +217,16 @@ func (cmd CmdBackup) Execute(args []string) error {
 		return nil
 	}
 
-	// fmt.Printf("loading blobs\n")
-	// pb, err := newLoadBlobsProgress(s)
-	// if err != nil {
-	// 	return err
-	// }
+	fmt.Printf("loading blobs\n")
+	pb, err := newLoadBlobsProgress(s)
+	if err != nil {
+		return err
+	}
 
-	// err = arch.Preload(pb)
-	// if err != nil {
-	// 	return err
-	// }
+	err = arch.Preload(pb)
+	if err != nil {
+		return err
+	}
 
 	_, id, err := arch.Snapshot(newArchiveProgress(stat), target, parentSnapshotID)
 	if err != nil {
diff --git a/testsuite/test-backup-dedup.sh b/testsuite/test-backup-dedup.sh
new file mode 100755
index 000000000..a3f2e7a4d
--- /dev/null
+++ b/testsuite/test-backup-dedup.sh
@@ -0,0 +1,23 @@
+set -e
+
+prepare
+run restic init
+
+# first backup without dedup
+run restic backup "${BASE}/fake-data"
+size=$(du -sm "$RESTIC_REPOSITORY" | cut -f1)
+debug "size before: $size"
+
+# second backup with dedup
+run restic backup "${BASE}/fake-data"
+size2=$(du -sm "$RESTIC_REPOSITORY" | cut -f1)
+debug "size after: $size2"
+
+# check if the repository hasn't grown more than 5%
+threshhold=$(($size+$size/20))
+debug "threshhold is $threshhold"
+if [[ "$size2" -gt "$threshhold" ]]; then
+    fail "dedup failed, repo grown more than 5%, before ${size}MiB after ${size2}MiB threshhold ${threshhold}MiB"
+fi
+
+cleanup