CrontabSpec
import type { CrontabSpec } from "https://googleapis.deno.dev/v1/spanner:v1.ts";CrontabSpec can be used to specify the version time and frequency at which the backup is created.
§Properties
Output only. Scheduled backups contain an externally consistent copy of
the database at the version time specified in schedule_spec.cron_spec.
However, Spanner might not initiate the creation of the scheduled backups
at that version time. Spanner initiates the creation of scheduled backups
within the time window bounded by the version_time specified in
schedule_spec.cron_spec and version_time + creation_window.
Required. Textual representation of the crontab. User can customize the
backup frequency and the backup version time using the cron expression. The
version time must be in UTC timezone. The backup will contain an externally
consistent copy of the database at the version time. Full backups must be
scheduled a minimum of 12 hours apart and incremental backups must be
scheduled a minimum of 4 hours apart. Examples of valid cron
specifications: * 0 2/12 * * * : every 12 hours at (2, 14) hours past
midnight in UTC. * 0 2,14 * * * : every 12 hours at (2, 14) hours past
midnight in UTC. * 0 *\/4 * * * : (incremental backups only) every 4
hours at (0, 4, 8, 12, 16, 20) hours past midnight in UTC. * 0 2 * * * :
once a day at 2 past midnight in UTC. * 0 2 * * 0 : once a week every
Sunday at 2 past midnight in UTC. * 0 2 8 * * : once a month on 8th day
at 2 past midnight in UTC.