How to back up to external hard drive using time machine

I just bought a new drive external toshiba with 500 GB of memory. When I tried to back up my computer last night through a time machine, I thought that it worked, but when I woke up this morning, time machine told me that my oldest and the most recent backup is none which means that it does not cross. I tried again this morning but after hitting "back up now" time machine prepares the backup, and then start it, giving me a ridiculously ETA such a 15 hours, then never completely complete the back which is really confusing so I do not know what to do.

Did you partition and format your new drive before using it? What version of Mac OS X? See use Time Machine to back up or restore your Mac - Apple Support and that Mac Basics-Time Machine backs up your Mac. Visit Time Machine FAQ of Pondini helps with Time Machine. It is a vast site with almost everything that you need for using Time Machine. You will not find a better resource for Time Machine in one place. Due to the disappearance of James Pondini, the site is is no longer updated. Therefore, some information may be somewhat outdated.

Tags: Mac OS & System Software

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    -------------------------------------------------------------------------------- ---------------------

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    10.11.5 worm.

    MacBook Air (13 inch, early 2015)

    Intel Core i5 to 1.6 GHz

    DDR3 4 GB 1600 MHz

    Macintosh HD

    Intel HD Graphics 6000 1536 MB

    -------------------------------------------------------------------------------- ---------------------

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