Clean up the doc field checking.
Correct the package referenced relative to Metadata.
Address use of panic.
Add a note about why Origin is a separate type from Metadata.
Fix an error message.
Use a more canonical form for testing interface satisfaction.
Explain why there are unimplemented methods in backupMetadataStorage.
Drop the superfluous "Backups" from test names.
Remove divider comments.
Add a DB dumper abstraction for mongo.
Clean up the legacy backup tests.
Test root.tar as well.
Refactor the legacy Backup function to be more suited toward use in a backups API.
Get rid of the legacy Backup function.
Remove dead code.
Move the DB-related code into its own package.
Move the files-related code into its own package.
Add a backup archive abstraction.