![]() ![]() When I unmounted and remounted the disk image, however, the video was corrupted. The whole file copied without error! I opened the file, verified that the video played back start to finish, checksummed the file – as far as I could tell, the file was intact and whole on the disk image. Curious, I copied a video file to the disk image volume to see what would happen. Unnoticed by us, Apple, and thousands of developers, however, is a very subtle behavioural difference that is specific to APFS on a sparse disk image.Įarlier this week I noticed that an APFS-formatted sparse bundle disk image volume showed ample free space, despite that the underlying disk was completely full. As far as creating and mounting disk images is concerned, APFS and HFS+ are easily interchangeable, so adding support for APFS was very straightforward. Mike Bombich: Naturally, when Apple introduced APFS in macOS High Sierra, we sought to offer support for using APFS on destination disk images when doing so would match the format of the source volume. Tell us what the problem is and how you found it? your SSD startup disk) are not affected by this problem If you make backups to network volumes, read on to learn more. What I describe below only applies to APFS sparse disk images. Disk images are not used for most backup task activity, they are generally only applicable when making backups to network volumes. Mike Bombich: While the underlying problem here is very serious, this is not likely to be a widespread problem, and will be most applicable to a small subset of backups. By formatting the disk image volume using an Apple-native format, we can do things like back up system files. macOS has been using disk images for decades, and we find them particularly useful when making backups to network volumes. They're files, but they act like a hard drive – you mount a disk image by double-clicking the file, then it behaves like it's another hard drive attached to your Mac. Mike Bombich: Disk images are handy devices. While onsite backups are great, I also recommend Backblaze for an online backup service in case the external drives are stolen or damaged.In a recent blog post, Carbon Copy Cloner developer Mike Bombich revealed that he had uncovered a bug in the Apple File System, or APFS, as a result of his work with "sparse" disk images. Until Apple issues a macOS update that resolves this problem, Bombich Software are dropping support for APFS-formatted disk images.Īpple's APFS file system which is now part of macOS High Sierra apparently suffers from a disk image vulnerability that in certain circumstances can lead to data loss when working with sparse disk images. ![]() The first clone will take a while, but the following clones will be much faster as it will only be updating new files. Now that the schedule is all set up, click Clone.I do mine weekly and have it set to silently ignore the schedule if the drive isn’t present. Under the Schedule tab, create your schedule.Under Safety Net, you can decide if you want the clone drive to include deleted items from the source drive while it updates the existing cloned drive.Click Destination, and then choose the external drive you want to use as the clone drive.This is the drive from which you want to create the clone. Under the Source tab, select your built-in drive. ![]() I leave my Clone drive at work and have it set to run every Monday morning. CCC5 makes it easy to create a schedule that can clone a drive on a system schedule. While Time Machine is the easiest way to back up your Mac, I like having a direct clone of my drive. Carbon Copy Cloner 5 (CCC5) now includes support for macOS High Sierra for creating bootable backups.
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