Several way are available for take Magento 2 database backup but using command line backup is safe and secure.
Check below steps for quick and easy way to take database backup.
#1 Login to your Magento server (SSH – Command Prompt)
#2 Go to your magento website directory using cmd
#3 Run database backup command
Run this Command in your command prompt :- php bin/magento setup:backup –db
#4 Check your database in var/backups/ directory.