Newbie question--finalize disc

[hotdog321]

I'm sorry to post such a newbie question, but I've been digging around for hours and I can't find an answer:

 

I'm a photographer backing up files onto a 25 gig BD-R, but a BD-R is so large I want to burn files in multiple sessions. For instance, I want to back up this week's photo assignments, then add more images next week until the disc is full. Basically, I want to use the BD-R as a hard drive until I am ready to finalize the disc.

 

What setting do I use to make ImgBurn stop finalizing the disc until I am ready?

 

Thank you very much!

[Cynthia]

You can't, as ImgBurn currently doesn't support multi session discs.

[hotdog321]

You can't, as ImgBurn currently doesn't support multi session discs.

 

Thank you! Not an answer I like, but at least I can stop looking!