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xorriso, the right way to do incremental backup

I tried to follow the manual. Perhaps it's only me but I didn't get it.
I tried the following:

$ xorriso -outdev /dev/sr0 -speed 1 -blank as_needed -as mkisofs -exclude-list .exclude.lst -print-size .

which wrote 2GB data to the disk. Then I did:

$ xorriso -dev /dev/sr0 -speed 1 -as mkisofs -exclude-list .exclude.lst .

Hoping to see only a few bytes written to the same disco (perhaps the
only file changed is .bash_history) and it wrote another 2GB to the
disco. So this mustn't be the right way. Can you give some hint?


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