Snapshot creation and retention on the source Data volume follows your Snapshot Retention Policy.
This exception only applies to the special System volume in the source volume group, not to the Data volume. These volumes are already read-only so a snapshot is not required. MacOS Catalina and later: CCC won't create snapshots on the source System volume in an APFS volume group.
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If you have snapshots disabled for the source volume (see more on how to do that below), CCC will automatically remove the temporary source snapshot at the end of the backup task. Because the snapshot is mounted read-only, changes that you make to files while the backup task runs won't cause errors during the backup task - you'll get a true point-in-time backup of your data. When your backup tasks run, CCC will automatically create a snapshot on an eligible source volume and use that snapshot as the source for the backup task. Snapshots are not a permanent data storage strategy. Additionally, please keep in mind when developing your snapshot retention strategy that Apple's Installer may delete all snapshots from the startup disk when applying updates or major OS upgrades. This recommendation is specifically imposed by CCC upon the startup disk. Retaining snapshots will increase disk usage over time, however, so we recommend limiting retention of snapshots on the source. When snapshots are kept on the source volume, you don't need your backup volume to recover accidentally-deleted files. Maintaining snapshots on the source volume offers protection against accidental file deletion and modification. We also recommend that you consider purchasing an SSD for making bootable backups of your startup disk. If you are encountering poor performance on an APFS-formatted HDD device, we recommend that you disable snapshot support on that volume and delete any snapshots that are on that volume. APFS and snapshots on rotational HDD devicesĬCC will only automatically enable snapshot support on an APFS volume backed by a Solid State Device, and only when CCC can determine that the device is a Solid State Device - that assessment is often not possible on external devices. If you would like to use storage on your startup disk for snapshots, you can manually enable snapshot support for that volume. † CCC will not automatically enable snapshot support on the startup disk. For basic snapshot support, you don't need to configure any settings CCC will automatically manage your snapshots using a sensible set of defaults. When you select an APFS volume on an SSD device as a source† or destination to a CCC backup task, CCC will automatically enable snapshot support on that volume and set a default Snapshot Retention Policy for that volume. With a regularly scheduled backup, you will have very good protection against the most common risks to your data. When you develop your backup strategy, consider all of the possible risks to your data and decide whether and how you will mitigate those risks. At minimum, we recommend regularly scheduled backups to a locally-attached hard drive. Having a backup on an external disk will get you back to work immediately. If your startup disk fails, all the snapshots in the world aren't going to help you restore your startup disk and data. Support for snapshots at the filesystem level is an important and integral component of a backup strategy, but snapshots are not a complete replacement for a true backup on physically separate hardware. tornado, hurricane, flood - loss of both original and backups)
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An OS or software update that causes functionality regressions.Accidental file deletion or modification.There are several aspects of data protection that a backup aims to provide. The Role of Snapshots in a Comprehensive Data Protection Strategy Note: Snapshots are only available for APFS-formatted volumes on macOS High Sierra and later. When you configure CCC to make regular snapshots of your APFS-formatted volumes, you can quickly restore older versions of your files.
Once the snapshot is taken, each file within that snapshot will be available on the snapshot in its exact state at the moment that the snapshot was taken, even if you delete the file.
A snapshot is a point-in-time representation of a volume on your hard drive. Snapshots are a new feature of Apple's APFS filesystem, and they're available on macOS High Sierra and later. Watch a video of this tutorial on YouTube What is a snapshot?
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