CCC offers 128 bit and 256 bit AES encryption to encrypt disk images.To create a bootable backup, you must back up to a hard drive that is attached directly to your Mac.We recommend that you only use a disk image if you are backing up to a network volume.When you want to access the contents of that filesystem, you double-click on the disk image to mount the disk image as if it were an external drive attached to the machine.
Carbon Copy Cloner leverages disk images to provide you the flexibility of storing several complete backups on a single shared external hard drive. Disk images also greatly improve the performance of backing up to network attached storage (NAS) devices, such as the Airport Extreme Base Station and Time Capsule. If you want a read-only disk image for archival purposes, set the image format to one of the read-only formats. In general, sparse disk images only consume as much space as the files they contain consume on disk, making this an ideal format for storing backups. A sparse bundle may be desirable if the underlying filesystem upon which you save the disk image has a file size limitation (such as FAT32). ![]() If you have freed up some space on that disk since you created the disk image, you can manually expand the capacity of the destination disk image in Disk Utility. Choose Resize. from the Images menu in Disk Utility, select your destination disk image, then expand it as desired. We recommend that you do not expand the disk image such that it is larger than the capacity of the underlying disk. They do not, however, automatically shrink when files are deleted from them. As a result, the amount of disk space that the disk image file consumes will not necessarily reflect the amount of data that they consume. To reclaim disk space that is occupied by the free space on your sparse disk image, CCC will compact the disk image before attempting to mount it if the free space on the underlying volume is less than 25GB, or is less than 15 of the total disk capacity. In most cases, you do not need to compact the disk image yourself, but this functionality is documented here so youll understand why you might see CCC spending time Compacting the destination disk image at the beginning of a backup task. Be sure to unmount the disk image volume if it is already mounted. Also, note that the compacting process can take a while (e.g. GB disk image on a locally-attached volume). The system utility that compacts the disk image will refuse to run while the system (e.g. Whether to choose read-only versus read-only compressed comes down to time and space. If your destination is tight on space and you have a bit of extra time, you can compress the disk image. Compression rates vary on the content of your source, but you can typically expect to reduce the size of your disk image by about half when using compression. There is a subtle behavior that you should take note of when considering this option as a space-saving measure: CCC will first create a readwrite disk image, copy the selected items to it, then convert the disk image to read-only compressed. In this case, you will actually need twice the space on your destination as the items to be copied consume on the source.
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