More backup intervals with xdelta3 request
I was wondering how to save the space needed for backup and do not confuse the user so much. I suggest adding the "Weekly with daily diffs" and "Monthly with daily diffs" options to the Backup interval and use week/month master backup with "tar --use-compress-program=xdelta3" to generate new daily tar.gz.vcdiff. Download would take week/month master or week/month master with daily tar.gz.vcdiff and create new full tar.gz in user's backup directory.
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