HT3275 My iMac harddrive only has about 100 gb of use on it. But my backup disk has over 300 gb used up on it. Why would this be?

My iMac hard drive only has about 100 gb of use on it. But my backup disk has over 300 gb of usage on it. For instance, my iphoto library shows about 13 gb of photos but the backup disc shows almost 20 gb of photos in the iphoto library. Why would this be?

Because you are using Time Machine which is an archiving backup utility. Any change that is made to a file will cause another fully copy of the file to be backed up. Over time a Time Machine backup will take up an entire hard drive no matter how large the drive may be.

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    Welcome to the Apple Support Communities
    See > http://pondini.org/TM/C12.html

  • "The identity of the backup disk has changed..."

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    Pondini wrote:
    If you haven't, try turning Time Machine OFF before you get that message. Then select the NAS via Time Machine Preferences > Select Disk. I think that will reset the element in the plist mentioned in that thread, and the problem will go away.
    I went ahead and tried this, but the condition still persists. When I have a chance, I'll go back and look at that other thread and see if I can glean anything useful from it. In the meantime, I may just have to live with the current situation. Thanks.

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  • Time Machine reports identity of backup disk has changed

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    Cody DH wrote:
    ... I'm not sure if this is a bug in Mavericks, a bug with my Time Capsule, or something indicative of a hardware issue either at my MBP or my Time Capsule.
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  • I get a message saying backup failed on my Time Machine because backup disk image is already in use. I am the only one using this machine.

    My Time Capsule keeps telling me that backup failed because backup disk image is already in use. I'm the only one using this machine.

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