different types of BACKUPS available in sql server are full 
database backup, differential database backup, 
transactional log backup, files and filegroup backup.
for new database we will go for full database backup, and 
if the the database is in full database backup type,then we 
do differential database backup or transactional log backup.
if the database size is too heavy means the database is 
VLDB then we go for files and filegroup database backup.