04-16-2010, 11:03 AM
Update: I added 20 new rips to the itunes library, did NOT run iTunes from other than the computer to which the external drive is attached, and the incremental backup went as expected, copying only the files added. I repeated the process, adding files from yet another networked computer that I'm using to rip and, again, the backup copied only the added files.
Then I went into iTunes and added comments to a few movies that were already on the backup; ran SD and it copied those files where I added comments. So that may explain some things as I had added information to a great number of the files that were already backed up before doing the incremental backup that prompted the OP. I don't think I changed EVERY file though, so I'm still wondering why the incremental backup in question copied every single file, but at least I'm comfortable with things I've discovered so far. The kicker will come when I try accessing iTunes from one of the other computers - and we know I will have to try it to satisfy my curiosity. I sure don't want to copy the entire 735GB all over again, but I really gotta know.
Then I went into iTunes and added comments to a few movies that were already on the backup; ran SD and it copied those files where I added comments. So that may explain some things as I had added information to a great number of the files that were already backed up before doing the incremental backup that prompted the OP. I don't think I changed EVERY file though, so I'm still wondering why the incremental backup in question copied every single file, but at least I'm comfortable with things I've discovered so far. The kicker will come when I try accessing iTunes from one of the other computers - and we know I will have to try it to satisfy my curiosity. I sure don't want to copy the entire 735GB all over again, but I really gotta know.