diff --git a/ctl/backup.go b/ctl/backup.go
index 403860656..d92316b2f 100644
--- a/ctl/backup.go
+++ b/ctl/backup.go
@@ -101,6 +101,8 @@ func (cmd *BackupCommand) Run(ctx context.Context) error {
 	// Backup schema.
 	if err := cmd.backupSchema(ctx, tw, schema); err != nil {
 		return fmt.Errorf("cannot back up schema: %w", err)
+	} else if err := cmd.backupIDAllocData(ctx, tw); err != nil {
+		return fmt.Errorf("cannot back up id alloc data: %w", err)
 	}
 
 	// Backup data for each index.
diff --git a/pilosa_internal_test.go b/pilosa_internal_test.go
index aca9c6e92..3de8cfbbf 100644
--- a/pilosa_internal_test.go
+++ b/pilosa_internal_test.go
@@ -16,6 +16,7 @@ package pilosa
 
 import (
 	"bytes"
+	"io"
 	"reflect"
 	"testing"
 
@@ -73,6 +74,8 @@ func (s *memAttrStore) BlockData(i uint64) (map[uint64]map[string]interface{}, e
 	return nil, nil
 }
 
+func (s *memAttrStore) WriteTo(w io.Writer) (int64, error) { return 0, nil }
+
 func TestAPI_CombineForExistence(t *testing.T) {
 	bm := roaring.NewBitmap(pos(1, 1), pos(1, 2), pos(1, 3), pos(1, 65537), pos(1, 65538), pos(2, 1), pos(2, 2), pos(2, 5), pos(2, 65537), pos(2, 65538))
 	buf := new(bytes.Buffer)