All your jobs are stored in msdb, so a backup of msdb will contain all your jobs.
As other people have said, it is a good idea to also have scripts for all your jobs. This means they can be re-created if you need to build a new server, or for any other reason.
Original author: https://github.com/SQL-FineBuild/Common/wiki/ 1-click install and best practice configuration of SQL Server 2019, 2017 2016, 2014, 2012, 2008 R2, 2008 and 2005.
When I give food to the poor they call me a saint. When I ask why they are poor they call me a communist - Archbishop Hélder Câmara