Sigil does not save automatically.
You should always save your epub manually as only you know when it is time to save versus revert to an earlier saved version.
What version of Sigil are you using? Sigil 0.9.8 has been changed and it should no longer show you the path inside temp and should show a placeholder. To set an new temp directory, first save any open epub documents. Then create a Sigil specific temporary folder someplace in your home directory, or in Documents or whereever you want. Give it a name like Sigil_temp with no spaces in it.
Then use that preference setting to enter the full path to your just created Sigil specific temp folder and then after applying your changes, exit out of Sigil.
Note that you should never open that Sigil_temp folder or touch any of the files in it when Sigil is open. Sigil will always clean up after itself once you exit from the program. If Sigil ever crashes, it will not get a chance to clean up after itself. In that hopefully rare case you can manually empty the contents of Sigil_temp but do not move it or rename it otherwise Sigil will be unable to find it on start-up and should revert back to the standard Mac temp folder and your problems will return.
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