Selective recovery.
WHY IT IS USUALLY BETTER
Restoring everything rolls back everything. If one file is broken or one table is corrupt, you do not need to lose a week of orders to fix it.
RESTORING ONE FILE
From JetBackup, browse the restore point and restore that file alone.
From your own archive, extract just that file and upload it.
RESTORING ONE DATABASE TABLE
Export the table from your backup using phpMyAdmin, then import it into the live database, dropping the existing version of that table first.
Be careful: tables have relationships. Restoring one in isolation can leave the data inconsistent.
RESTORING ONE SITE FROM A MULTI-SITE ACCOUNT
Restore that site's directory and its database, leaving the others untouched.
RECOVERING DELETED CONTENT
Sometimes the content is in the backup database and can be copied into the live one, rather than restoring the whole thing.
This requires care and a backup of the current state first.
WHEN TO RESTORE EVERYTHING
When the site is comprehensively broken, or after a compromise where you cannot be sure what was touched.
