+// BackupReader checks cancellation between reads of an archive or file.
+type BackupReader struct {
+ ctx context.Context
+ reader io.Reader
+}
+
+func (r BackupReader) Read(data []byte) (int, error) {
+ if r.ctx.Err() != nil {
+ return 0, r.ctx.Err()
+ }
+
+ count, err := r.reader.Read(data)
+ if err != nil {
+ return count, fmt.Errorf("read backup data: %w", err)
+ }
+
+ return count, nil
+}
+