They are not available wit h SJA itself. However you can use a windows bat file.
that bat file will then have one line for each database like
SJA job1
SJA job2
etc.
finally you will need to use a zip program that can be called from command line and delete the originally file once it is added to the zip archive
Filzip (www.filzip.com) for instance can do this.
So
SJA job 1
filzip
del … (delete file now that is is added to zip)
SJA job 2
filzip
del … (delete file now that is is added to zip)
etc.
And then the bat file itself can be scheduled.
more examples of the use with SJA and .bat -files: http://webyog.com/faq/27_35_en.html