DVD Plus or minus RW?

I want to back up my iPhotos and documents using a Burn Folder in the Finder. Is there any advantage to one of these formats – DVD+R or DVD-R – over the other?

You cannot erase a DVD-R. What the method that I recommended was where DU does not erase the DVD, but instead it doesn't close the previous session (or burn). Normally what happens when you burn a disc is that when the content is finished burning, the application/OS "closes" the session. It basically makes the free space on the rest of the disc seem "unusable" or "full" to other applications when you insert the disk the next time. On Re-writables, you can erase the media. On non-RW's, you cannot erase the data. Instead, DU allows other applications to see the free space on the disk as "usable". Be careful though, you have to continuously use DU to burn the disks, because even though you've left the disk appendable or "open", other applications will "close" the session and not allow you to burn to the disk again.
Every time you have more photos to back up, all you have to do is create a Disk Image of only those photos, and NOT the ones you previously burned. You can continuously add photos to the disk using this method until the disk is full.
Trevor

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