The specification for incremental backup chains.
An incremental backup stores the delta of changes between a previous
backup and the database contents at a given version time. An
incremental backup chain consists of a full backup and zero or more
successive incremental backups. The first backup created for an
incremental backup chain is always a full backup.
Protobuf type google.spanner.admin.database.v1.IncrementalBackupSpec
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