Start by sorting the files you want to archive into several different folders, which total slightly less than the capacity of the BD-R disk you’ll be using. It makes better sense to burn several smaller disk images to make up each BD-R archive. Although you can create one huge disk image of, say, 25 GB size, if that becomes damaged or corrupted, none of files within it is likely to be recoverable. The best way to preserve those, and other file metadata, is to put those files into a disk image, and burn that to BD-R. But all the most useful and important, particularly non-Apple custom, extended attributes are stripped in the process of burning files to a disk. One of the problems that I’ve identified with my new app Dintch, which checks the integrity of files, is that its custom extended attribute is one of many which isn’t written to BD-R disks even when you opt for them to be in ‘Mac only’ format.īurning with the ‘Mac only’ option preserves a few more extended attributes than the standard ‘Mac and PC’. This applies most significantly to extended attributes, which are becoming increasingly important and better-supported by iCloud, for example. Don’t be deceived by options which look as if they’ll avoid such problems: setting your BD-R disk to be ‘Mac only’, for example, promises that some of the additional information held in HFS+ and APFS is saved to that disk, but some of it still isn’t. In practice this means that some of the information you expect to be associated with documents will be omitted when burning them to a BD-R disk. Unlike copying files between regular volumes, optical disks use their own file systems, with the option of adding support for some special features from others. This article explains some of the problems, and how you can work around them. Unfortunately, it’s also quick and easy to end up with archives which aren’t faithful copies of the originals. A good BD-R burner should cost between $/€/£ 80-200, so for a modest outlay you can start archiving your documents. Depending on the drive and disk, you can store 25-100 GB on each disk, and there are variants like M-Disc which claim to be of ‘archival’ quality (however sceptical we should be of all such claims). When you want to make more permanent archives of documents and other files from your Mac, the most obvious choice of medium is Blu-ray.
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