By default, Time Machine mirrors the entire boot drive of an OS X system, and should update on an hourly basis to keep the backups current with changes to your system.
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By combining hard links to old backups along with new backup data, it quickly creates a full representation of your system by copying only changed files to the backup. In this sense, in its default configuration each backup represented in Time Machine should be a fully restorable backup instance; however, recently users are finding that in OS X Mountain Lion this is not always the case.
Apparently some corruption is occurring in the Time Machine preferences file that is preventing more-recent backups from appearing as valid backups for use during restoration. This problem not only prevents the backups from being listed as valid restore points, but also keeps migration tools like Apple's Setup Assistant and Migration Assistant from using them.
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To check whether your backups are experiencing these problems, first go to the Time Machine menu extra enabled in the Time Machine system preferences and choose "Back Up Now" to manually create a new backup instance. When the backup is completed, reboot your system to the Recovery drive by holding the Command-R keys immediately after hearing the boot chimes at startup.
At the OS X Tools window, choose the option to restore from backup, and then see what backup instances are available. The latest backup you created should be listed as the first restore point available. If the available backups listed do not include this latest one, and especially if the only ones available are from a while ago even if you have had Time Machine running regularly, then it is likely you are experiencing this bug.
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Unfortunately, for now the only known way to fix this is to reset Time Machine and start over, which can be done by the following steps:. When you do this, new backups created on the drive should now be accessible. Prior backups on the drive should continue to be available. Have a fix? Post them below or e-mail us!
Time Machine: How to Force a Backup to a Specific Disk
Mobile World Congress We live in the era where data is one of the most valuable possessions of a person. On the other hand, losing access to data can also happen easily today. Fortunately, Mac users have the Time Machine backup feature to back them up pun intended. The default setting is once every hour.
The backup process eats up a significant amount of system resources. This might influence the performance of other running apps and slow down everything, especially for those with an older system.
Editing the Machine
And having your system slow down every hour for several minutes is no fun. Unless you work with crucial data that needs to be backed up every hour, most daily users can live with less frequent backups and better system performance. How do you modify the backup frequency of Time Machine in Mac?
One thing is for sure: The only available options are selecting the backup disk and selecting folders to exclude from the backups. To change the backup frequency interval or create a more sophisticated scheduling, you need a little help from a free application called TimeMachineEditor.
Back up your Mac with Time Machine
This app is compatible with Mac OS X After downloading and installing the app, open it, and you will see its main interface. The app provides you with three modes of operation: The default one-hour interval backup time of Time Machine can be changed to longer or shorter depending on your needs. For example, you can turn off the process during your work hours. You can also disable the backup when your laptop is using battery power to conserve energy.
If you want to set a more sophisticated backup schedule based on various dates, times, weeks, months, etc. Other schedule modifications can also be done from the Time Machine Editor.