Details of the each workflow will be available inside "backup.sql".
When we restore the backup file in another WFA machine all the workflows/commands will be displayed.
For each workflow also we can take backup using below steps:
Step1:
Go to Designer tab ->click on Commands and by pressing Unlock icon the relevant command will be unlocked:
We need to unlock which we required.

Step2:
Go to Designer Tab -> click on Workflows and unlock the workflow then Export Icon will be enabled as mentioned in above snapshot or if we right click on workflow,
there will be on option called export which we can take backup only that purticular workflow.
For more details, please let us know your convinient time to have webEx.
-Shiva