Dump database to file with date in name:
mysqldump -u USERNAME -pSECRETPASSWORD --single-transaction --quick --lock-tables=false DBNAME_HERE > /home/backup/mysql/DBNAME_HERE_`date "+%Y-%m-%d-%H-%M"`.sql
Crontab version: dump every hour at minute 5
5 * * * * mysqldump -u USERNAME -pSECRETPASSWORD --single-transaction --quick --lock-tables=false DBNAME_HERE > /home/backup/mysql/DBNAME_HERE_`date "+\%Y-\%m-\%d-\%H-\%M"`.sql