Â If any of the differential backups becomeÂ damaged, then the file can not be completed restored. Â To restore a differential backup, the software would have to restore the original file, and then re-apply each change, repeating as necessary. Â While a differential backup greatly reduces the space requirements, theÂ restoration process becomes much more complex. Â Retrospect will compare the new version of the file versus the old version, and store only the changed portionÂ of the file. Retrospect performs an first full backup, and then stores the differentials.Â Â While this simplifies the backup and restoration process, it can greatly increase the storage space that you need.

Movie, MP3, etc), the impact will be much larger due to storing all the variant versions of the file. Â For smaller files, this has a minimal impact, but if the file is a large file (eg. Â Each time a file is modified, it will be stored on the Time Machine drive, when Time Machine runs. After a firstÂ backup, only the changes since the last backup areÂ stored. Technically Time Machine uses “Incremental Forever” backups.Time Machine backups are incremental backups, not differential.How this differs from Retrospect, or other packages, is as follows: Airport Extreme w/Connected external Media.An available Mac OS X Server version 10.5 or 10.6 volume.An external disk (USB or FireWire) attached to another Mac running Leopard or Snow Leopard on the same local network.A secondary partition Â (Personally not recommended!).Time Machine supports the following backup devices: Time Machine works, by making an Master Snapshot of the computer, and then periodically recording any differences/deltas between the last snapshot, and the current state of the hard drive. Using CRON to automate Time Machine Backups.Time Machine, Thunderbird and Entourage.Time Machine and Lion Server (& Mountain Lion, too!).The downside to excluding the System files.

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