Backin up PS2: -R or +R

[Blue007]

I am just wondering because I bought a 50 pack of Sony DVD+R media to back up some of my movies. They seem to work fine but since reading this thread I am a little concerned about watching the movies now. I have been searching and searching the net but this is the only site and thread I can find on this issue concerning +R media and laser burnout. Is the industry ignoring this issue due to marketing or does this laser burnout issue only apply to games copied on +R media due to the tracking of the lasers on ps2 machines?