CDC Tracking Tables Are Not In The Backup?

I have enabled CDC on my productive database with

USE MyDB
GO
EXEC sys.sp_cdc_enable_db
GOand I have enables cdc on tables within the database using
USE MyDB
GO
EXEC sys.sp_cdc_enable_table
@source_schema = N'dbo',
@source_name = N'MyTable',
@role_name = N'MyRole',
@filegroup_name = N'MyDB_CT',
@supports_net_changes = 1
GO

As per [URL] ....

Data changes are then stored in a system table called cdc.dbo_MyTable_CT So far so good.I backup the database and restore it

backup database MyDB
to Disk = 'CBackupMyDB.bak'restore database MyDB1
from disk = 'CBackupMyDB.bak' No table called cdc.dbo_MyTable_CT in system tables!

Have I missed a step? and is there a way to get these tables into the backup.I am now building a ssis job to move the contents of the cdc.dbo_MyTable_CT to an archive table, but i am worried that if I had to restore the database to a point in time I may not be able to do it for these tables.