My time machine wont support my hard drivers

I´m trying to use Time Machine, but i got a message who says: "the backup disk does not have the required format Mac OS Extended (Journaled)". And I've tried two different hard drives who support mac. What to do?

Hi Marte, I had the exact same problem when I first got my Mac and wanted to use my Seagate hard drive for my Time Machine.  What I had to do was to format it to do so.  It's easy to do this yourself. 
If you go to Spotlight Search on the top right of your toolbar (looks like a magnifying glass) and type in Disk Utility, you will see in the list "Disk Utility" highlighted, either as a Top Hit or an Application.  Choose one of these to open the Disk Utility.  In the window that opens, you will then see your Mac HDD listed, along with the hard drive you want to use as your Time Machine.  You will see the name of the your external hard drive listed twice.  Single click on the lower one.  To the right, you will then see three tabs - "First Aid", "Erase" and "Restore".  Choose "Erase".  In the Format option that you will then see half way down the window, choose Mac OS Extended (Case Sensitive, Journaled, Encrypted).  Then click the Erase option.  This option formats the hard disk for use with Mac or Windows which will give you greater flexibility shuld you need to ever use it on a Wondows machine.

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