Parse parses a full Database file using the given reader.

TypeFull is a backup of a ZFS dataset in its entirety.

TypeIncremental is a backup of an incremental snapshot.

Cadence describes the cadence of backups, and how older backups are deleted as they decay over time.

DB is a database file of an instance of Entries for a ZFS file system dataset.

Entry is a reference to a backup file for a particular ZFS file system dataset.

Type is the type of a backup entry.