In ideal scenario , it is a good practice to stop all the qlik sense services to get the backup of QRD.
However, you can still make a backup without stopping all services.
Open the Command Prompt in Microsoft Windows.
Produce a dumpfile for the repository database (that is, a single file for the entire database):
cd "C:\Program Files\Qlik\Sense\Repository\PostgreSQL\<database version>\bin"
pg_dump.exe -h localhost -p 4432 -U postgres -b -F t -f "c:\QSR_backup.tar" QSR
If you are prompted for the PostgreSQL super user password, enter the password that was given during the installation of Qlik Sense.
Make a backup of the dumpfile for the repository database.