After that, only the files that have changed should be copied. Even so, TM may copy all or almost all the files. The next time you back up, you may be prompted to "inherit" the backup history. From the Partition Layout menu in the window, selectĬlick the Apply button and confirm when prompted. To be safe, you must have at least two complete, independent, up-to-date backups. This procedure will destroy all data on the drive. If it's not GUID Partition Scheme or Logical Volume Group, see below. At the bottom of the window, note the Type. To confirm, launch Disk Utility and select the icon of the drive in question-not any of the volume icons nested below it. Time Machine doesn't work reliably with other partition types. The problem is often, or perhaps always, caused by backing up a volume on a drive that doesn't have a GUID or CoreStorage partition table. Hence, there isn't sufficient space on the drive even after trimming old files. Time Machine sees the upgrade to Yosemite as a "new" computer, so it wants to make a new, full backup separate from the other backup. You can either erase the backup drive and start your backups anew or replace the drive with a larger drive. Once TM has found it cannot free up enough space for a new backup it reports the disk is full. Thus, from the user's view of the TC it appears that no space has been freed, although there may be space in the sparsebundle. Note, that on a Time Capsule the sparsebundle grows in size as needed, but doesn't shrink. If it was there for at least a week, it will be kept as long as there's room. If it was there for at least 24 hours, it will be kept for at least a month. So, how long a backup file remains depends on how long it was on your Mac before being deleted, assuming you do at least one backup per day. The weeklies are kept as long as there's room. 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. TM only deletes older files if they have been deleted from the source and when TM needs space on the backup drive for a new incremental backup. (My wife who is still using Mavericks is continuing to successfully backup to the same drive.) I'm running Yosemite 10.10.0 on a mid-2011 MacBook Air, backing up to a Sinology NAS. It worked fine under Mavericks, but under Yosemite it seems that Time Machine doesn't realize that the hundreds of gigabytes on the external drive has already been backed up before and doesn't all need to be backed up again.Īny thoughts? I had a backup that was several months old earlier once I started getting this error, I wiped that backup thinking that a fresh backup might sole the error. Time Machine is backing up both my small internal hard drive (128 GB) and the rest of the backup comes from an external drive. However, each time Time Machine tries to run its backup, I get the same error. Subsequent incremental backups should only take up a fraction - and I'm confident that I haven't added hundreds of gigabytes of new data to my disk. The initial backup took up about 898 GB of my 1.61 TB machine. Select a larger backup disk or make the backup smaller by excluding files." After the initial backup, I get these errors: " The backup disk needs 838.03 GB for the backup but only 712.05 GB are available. I'm having a problem with my Time Machine backup ever since upgrading to Yosemite.
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