Time machine says identity changed.

It proposes to erase the whole disk. How can I start time machine ağain without erasing the whole disk?

Hi metinus,
There are a number of possible reasons why Time Machine would give that error message. They are detailed in the following article -
OS X Mavericks: If a message says the identity of the backup disk has changed
http://support.apple.com/kb/PH14283
Thanks for using Apple Support Communities.
Best,
Brett L

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    Walter Goodman wrote:
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