Preparing your backup disk for a backup of macOS.Learn about alternatives to backing up macOS to non-macOS-formatted volumes.It is not possible to update an OS backup on a network volume. If you open the Get Info panel for the volume, you will see that the volume format is "AppleShare" or "SMB", not HFS+ or APFS. Even if your destination volume is macOS-formatted, if it is attached to an Airport Base Station (for example), then you're accessing the volume via file sharing. Note that the "locally-attached" caveat is an important distinction. if you were to mount the startup disk of another Mac via File Sharing, the system files on that network volume cannot be copied in a meaningful way. Likewise, CCC will not copy system files from a network volume, e.g. To prevent any misunderstandings about this result, CCC will exclude system files from a backup task if the destination is not a locally-attached, macOS-formatted volume. In short, you cannot restore a functional installation of macOS from a backup stored on a non-macOS volume. When system files are copied to or from non-macOS filesystems, important metadata are unavoidably lost, resulting in files that cannot be restored to their original functionality. This requirement is also carried to a backup volume. MacOS can only be installed on a macOS-formatted volume. CCC will only back up system files to or from locally-attached macOS-formatted filesystems Please note that network volumes mounted by third-party software is generally not supportable. You can mount network volumes in the Finder, or via the Mount a network volume. In general, you can reasonably expect to back up user data - files that belong to your user account - to and from non-macOS-formatted volumes. However, these filesystems offer limited support for macOS-filesystem features, so special consideration must be given when backing up to these volumes. Non-macOS-formatted volumes are presented in CCC's Source and Destination selectors in the same manner as macOS-formatted volumes, so there are no special steps required for backing up to or from these filesystems. AFP and SMB via macOS and Windows File Sharing) and to other non-macOS-formatted volumes such as FAT32. In addition to backing up to volumes formatted with the macOS standard HFS+ or APFS format (collectively referred to as "macOS-formatted" from here forward), CCC can copy user data files to network volumes (e.g.
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