Class Backup (7.1.0)

const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner();
const instance = spanner.instance('my-instance');
const backup = instance.backup('my-backup');

* @example
const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner();
const instance = spanner.instance('my-instance');
const sourceBackup = instance.backup('my-source-backup');
const copyBackup = instance.copyBackup('my-copy-backup', 'my-source-backup');

const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner();
const instance = spanner.instance('my-instance');
const oneDay = 1000 * 60 * 60 * 24;
const expireTime = Date.now() + oneDay;
const versionTime = Date.now() - oneDay;
const backup = instance.backup('my-backup');
const [, backupOperation] = await backup.create({
  databasePath: 'projects/my-project/instances/my-instance/databases/my-database',
  expireTime: expireTime,
  versionTime: versionTime,
  encryptionConfig: {
    encryptionType: 'CUSTOMER_MANAGED_ENCRYPTION',
    kmsKeyName: 'projects/my-project-id/my-region/keyRings/my-key-ring/cryptoKeys/my-key',
  },
});
// Await completion of the backup operation.
await backupOperation.promise();

const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner();
const instance = spanner.instance('my-instance');
const backup = instance.backup('my-backup');
await backup.delete();

const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner();
const instance = spanner.instance('my-instance');
const backup = instance.backup('my-backup');
const alreadyExists = await backup.exists();
console.log(`Does backup exist? ${alreadyExists}`);

Backup.formatName_(
  'projects/grape-spaceship-123/instances/my-instance',
  'my-backup'
);
// 'projects/grape-spaceship-123/instances/my-instance/backups/my-backup'

const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner();
const instance = spanner.instance('my-instance');
const backup = instance.backup('my-backup');
const expireTime = await backup.getExpireTime();
console.log(`Backup expires on ${expireTime.toISOString()}`);

const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner();
const instance = spanner.instance('my-instance');
const backup = instance.backup('my-backup');
const [backupInfo] = await backup.getMetadata();
console.log(`${backupInfo.name}: size=${backupInfo.sizeBytes}`);

const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner();
const instance = spanner.instance('my-instance');
const backup = instance.backup('my-backup');
const state = await backup.getState();
const backupCompleted = (state === 'READY');

const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner();
const instance = spanner.instance('my-instance');
const backup = instance.backup('my-backup');
const oneDay = 1000 * 60 * 60 * 24;
const newExpireTime = Spanner.timestamp(Date.now() + oneDay);
await backup.updateExpireTime(newExpireTime);