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Time Machine Backup Issue

I currently have a MacBook Pro (13-inch, Mid 2012) running Sierra (10.12.6) (2.5 GHz Intel Core i5 4 GB 1600 MHz DDR3). All apps and iOS are up to date.

I have been using Time Machine for years and it has always deleted older backups automatically when there was little memory left. However, now when I click "Back Up Now" in Time Machine Preferences and my usual external backup drive is selected it says "Preparing Backup" and says 245GB of 500GB available underneath my backup drive name. After a period of time, it then proceeds to tell me "There isn't enough space on 'Seagate Backup Plus Drive'".

I have gone into the "Options" section, selected "Notify after old backups are deleted" and "Back up while on battery power" but that did not seem to help anything. It says the "Estimated size of full backup: 276.68GB" The drive used to have the Time machine logo on its icon on my desktop, but now it's just orange like a normal drive.

How can I get my Time Machine to keep backing up to my external hard drive again?

Your current backup requires 277GBs while your backup drive only has 245GBs available, hence, the reason for the warning.

Time Machine deletes older files if they have been deleted from the source when it needs space on the backup drive for a new incremental backup. Time Machine "thins" it's backups; hourly backups over 24 hours old, except the first of the day; those "daily" backups over 30 days old, except the first of the week. The weeklies are kept as long as there's room.

How long a backup file remains depends on how long it was on your Mac before you deleted it, assuming you do at least one backup per day. If it was there for at least 24 hours, it will be kept for at least a month. If it was there for at least a week, it will be kept as long as there's room. By default, Time Machine backs up hourly. That cannot be changed in Time Machine. There are third-party utilities that will modify the backup interval such as Time Machine Editor.

The Time Capsule sparse bundle grows in size as needed, but doesn't shrink. Thus, from the user's viewpoint of the Time Capsule, it appears that no space has been freed, although there may be space in the sparse bundle.

Once Time Machine finds it cannot free up enough space for a new backup it reports the disk is full. You can either erase the backup drive and start over or get a larger drive.

最后更新：2017-08-29 09:44:08

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