drush sql-dump --gzip --result-file=/path/to/target/[DATABASE_NAME]-$(date +%Y-%m-%d-%H.%M).sql
drush sql-dump --gzip --skip-tables-list=cache,cache_* --result-file=/path/to/target/[DATABASE_NAME]-$(date +%Y-%m-%d-%H.%M).sql
Just changed the [DATABASE_NAME] with your database.