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![]() However, Time Machine is smart enough to always hold onto at least one copy of every file on your Mac. In other words, if you created a Word file named My Resume on and haven’t edited or opened that file since then, Time Machine backed up this file when it was initially set up. ![]() Once the hard drive is full, it displays a message indicating that it’s going to delete your oldest backup, from Jin my example. Instead, it holds onto hourly backups for the past 24 hours, daily backups for the past month, and then weekly backups until the hard drive is full. In other words, it doesn’t hold onto each and every hourly backup. ![]() Time Machine regularly prunes, or deletes, some of these small incremental backups. These subsequent backups only include new and edited files and are called incremental backups. These subsequent backups are much, much smaller than the initial backup. Time Machine continues to automatically perform backups every hour when the Mac is on, awake and the backup hard drive is connected. This means that it copies the Mac operating system, as well as all applications and all of your photos, music, Word files, etc. The first time it performs a backup it copies all files onto the external backup hard drive. Let’s imagine you set up Time Machine on July 17, 2010. ![]() Let’s briefly review how Time Machine works. This is perfectly normally and is probably just fine. Has your Time Machine backup hard drive filled up? Are you seeing the “Time Machine deleted one or more backups to make room for new backups” notification? If so, don’t worry. ![]()
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