The Brno Regional Archive covers the southern part of Moravia. The years covered vary by parish.
The website contains birth, marriage, and death records from the late 16th century to about 1900. The years covered vary by parish. There are no Jewish registers held here. (They are in the National Archives in Prague.)
Most parish records have been posted. The law does not allow birth records of less than 100 years, or marriages and deaths records of less than 75 years to be posted. Even if a volume has records older than that timeframe, if it also includes newer records, it will not be posted until it meets the legal requirements.
Also note that some volumes are only an index, and some volumes contain records plus an index either at the end of the book or after each section of records (birth, marriage, or death).