@Override
    public String toString() {
        return "RocksDBBackupInfo{" + "backupId=" + backupId + ", numberFiles=" + numberFiles + ", timestamp="
               + timestamp + ", size=" + size + '}';
    }
RocksDB backup metadata info.

@author dennis
@author jiachun.fjc
jraft-rheakv/rheakv-core/src/main/java/com/alipay/sofa/jraft/rhea/storage/RocksDBBackupInfo.java