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Monomeeth ♦
Monomeeth ♦
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I had the same problem. Don't know if this, so maybe my experience will be helpful depending on whether you have other drives hooked up to your Mac. I

I have a 24TB ThunderBay RAID hooked up to my iMac and although there was enough space on my separate Time Machine HD (via USB), it gave me a warning that I needed over 2.5 TB5TB of extra space for a Time Machine backup of 120GB - yeah right! After a lot of cursing and.

After reformatting of the TM-HD, I finally unmounted the ThunderBay RAID, then switchingswitched it off and removingremoved the Thunderbolt connection from the iMac,. Only then did the TM backup to the Time Machine HD immediately wentwork without a hitch. Hope this helps. Maybe

Maybe something in the TM prefs got severely confused by having the RAID hooked up. I find TM on, but for me this solved the whole also very unreliable as it has a tendency to miss out on backing up certain filesproblem. C'est la vie :-)

I had the same problem. Don't know if this will be helpful depending on whether you have other drives hooked up to your Mac. I have a 24TB ThunderBay RAID hooked up to my iMac and although there was enough space on my separate Time Machine HD (via USB), it gave me a warning that I needed over 2.5 TB extra space for a Time Machine backup of 120GB - yeah right! After a lot of cursing and reformatting of the TM-HD, I finally unmounted the ThunderBay RAID, then switching it off and removing the Thunderbolt connection from the iMac, the TM backup to the Time Machine HD immediately went without a hitch. Hope this helps. Maybe something in the TM prefs got severely confused having the RAID hooked up. I find TM on the whole also very unreliable as it has a tendency to miss out on backing up certain files. C'est la vie :-)

I had the same problem, so maybe my experience will be helpful.

I have a 24TB ThunderBay RAID hooked up to my iMac and although there was enough space on my separate Time Machine HD (via USB), it gave me a warning that I needed over 2.5TB of extra space for a Time Machine backup of 120GB.

After reformatting the TM-HD, I finally unmounted the ThunderBay RAID, then switched it off and removed the Thunderbolt connection from the iMac. Only then did the TM backup to the Time Machine HD immediately work without a hitch.

Maybe something in the TM prefs got severely confused by having the RAID hooked up, but for me this solved the problem.

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azdawg
azdawg
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I had the same problem. Don't know if this will be helpful depending on whether you have other drives hooked up to your Mac. I have a 24TB ThunderBay RAID hooked up to my iMac and although there was enough space on my separate Time Machine HD (via USB), it gave me a warning that I needed over 2.5 TB extra space for a Time Machine backup of 120GB - yeah right! After a lot of cursing and reformatting of the TM-HD, I finally unmounted the ThunderBay RAID, then switching it off and removing the Thunderbolt connection from the iMac, the TM backup to the Time Machine HD immediately went without a hitch. Hope this helps. Maybe something in the TM prefs got severely confused having the RAID hooked up. I find TM on the whole also very unreliable as it has a tendency to miss out on backing up certain files. C'est la vie :-)