Capture the video from your GL2 with iMovie, Final Cut Expres/Pro, FootTrack, CatDV or similar app.
Note: If you use iMovie 08/09/11, just archive the .dv files that it creates. Do not
export DV from iMovie - when you export DV from iMovie, it does single-field processing, halving the resolution of the output.
IMO if you have Final Cut Express or Pro, use that to capture the video, as you will get QuickTime .mov files that can be used in almost any app.
DV takes about 13GB/hour of video, so you can estimate how much disk space you will need. You can use iDVD to burn the videos to DVD. For burning purposes, only the +length in time+ matters - you can fit up to about 2 hours of video on a single-layer DVD-R or +R, or about 4 hours on dual-layer media.