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IMac backup fails on WD My Book

Unfortunately I can’t backup my files on “My Book”. The following error message is shown:

Time Machine couldn’t complete the backup on “My Book”: The backup disk is not in MAC OS Extended (Journaled) format, wich is required.

It would be grat if somebody could help me.
Best regards

Erase your external hard drive with MacOS Journaled and tryagain.

Support for Western Digital Hard Drives | Western Digital

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