Execute multiple scheduled tasks sequentially

I have defined scheduled tasks which perform backup of few partitions and also includes file level bakcups.

Now I would like to perform all these backup operations as one task consisting of multiple steps:
Backup partition1
Backup partition2
Backup files
Shut down

Because all scheduled tasks have associated script I assume it would be possible to create one more script which calls/executes all other scripts.

Could you provide an example how a script should look like which calls
script1
script2
script3

Thank you.