database server writes data
pages from the backup media to disk. This action leaves the storage spaces
consistent to the point at which it was originally backed up. However, the
backup times for each storage space are usually different. A restartable restore
is restartable to the level of a storage space. If only some chunks of a storage
space are restored when the restore fails, the entire storage space needs
to be recovered again when you restart the restore.
Logical recovery. The database server replays logical-log
records on media to bring all the storage spaces up to date. At the end of
logical recovery, all storage spaces are consistent to the same point.
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