More thoughts …
It is not worth to backup all output files if we have the sources, the pfi and we are able to rebuild the outputs easily.
I was wondering if it could be possible to launch a (PF) batch to do this per tree or per folder.
If I follow your idea about jpg and tif, it should be possible to generate the right file type.
Is the batch processor able to do this ?
Is it available on Linux and Windows ?