Smart update during other activities
I was making a new copy to a clean external drive and noticed that SD seemed to be stuck for a long time. On further investigation, it turned out that my destination drive was up at about 163Gb and yet my source was a meagre 93Gb.
I finally figured it out. While SD was doing its' backup, I was also recording off-air an audio program using iRecordMusic and it was this activity that was causing SD to write a huge 100Gb+ audio file.
While I kinda understand and appreciate why this might happen, I'm wondering if there is anything I can do to stop this happening in the future as I frequently do unattended recordings that might kick in at the same time that SD is scheduled to run a backup. It would be a bit of a pain to try and continually remember to reschedule as appropriate.