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This is the temp backup to 25GB BD-R made on 1.22.2026 of a 5-week project still underway. Photo: D.D.Teoli Jr. I hope to be done with this project in 2 -3 weeks. When all is said and done, I will have about 2 months of part time daily work on this project dealing with over 7,000 files. While work is in progress it is backed up to disposable grade Blu-ray disc at about 22GB increments as well as hard drives. If the work is very slow going and tedious it may get backed up to Blu-ray in 10GB increments...it just depends. Once project is finished it will be put on large size Blu-ray M-Disc and archival Blu-ray disc and a variety of hard drives. Disposable Blu-ray discs are generally 35% to 40% of the price of archival grade Blu-ray discs and a fraction of the price of M-Disc Blu-ray. If you have a large budget, then use archival grade Blu-ray for everything, even disposable work in progress where discs may get trashed in a few days or a week or two. During post processing disposable Blu-ray are also used to view films in various stages of post work. Here is some test information at the link on the difference between archival grade Blu-ray and disposable Blu-ray discs I've done. Blu-ray Discs …they are not all the same. – Daniel D. Teoli Jr. Archival Collection – II Bottom line is...optical disc gives a permanent record of the material when all else fails. On projects that may take months or years to complete you don't want any hiccups if you need to recover your work in an emergency. <><><><> Daniel D. Teoli Jr. Archival Collection Daniel D. Teoli Jr. Small Gauge Film Archive Daniel D. Teoli Jr. Advertising Archive Daniel D. Teoli Jr. VHS Video Archive Daniel D. Teoli Jr. Popular Culture Archive Daniel D. Teoli Jr. Audio Archive Daniel D. Teoli Jr. Social Documentary Photography