25 GB .bt3 file in library that backups with Time Machine daily

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Level 1

1 points

25 GB .bt3 file in library that backups with Time Machine daily

Dear all,

Recently I discovered that around once a day Time Machine wants to backup around 25GB. It took me some time to figure out why this is the case since I did not do much with my Mac between two large backups. Using a tmutil compare command in Terminal I discovered that there is a file in my library of around 25GB which was changed since the last backup. Because of this change Time Machine wants to backup the file again and again.

The file is called genp.bt3 and can be found in the following location.

/Users/username/Library/Application Support/com.apple.sbd/A3004ECB-8AC4-4FBD-B88A-DE6673DCBD43/KeychainV0-tomb/genp .bt3

Can anyone help me with what this file is and why it is so big and changes so often? It takes up one fifth of my total hard drive space, so I will be glad if I can get rid of it.

Yours sincerely,

Inawt

MacBook Air, OS X El Capitan (10.11.1), null

Posted on Nov 17, 2015 2:29 PM

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Answer 1

Inawt Author

Level 1

1 points

Nov 17, 2015 2:55 PM in response to Inawt

I have the info pane of the file open for some time now and I noticed that it is slowly increasing in size (around 70 bytes per second). The file appears to be created on October 22

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Answer 2

Linc Davis

Level 10

210,131 points

Nov 17, 2015 3:02 PM in response to Inawt

Please take these steps to resynchronize the iCloud keychain. Your keychain on iCloud and your other Apple devices won't be affected. Take Step 2 only if Step 1 doesn't solve the problem.

Step 1

Back up all data.

Open the iCloud preference pane and uncheck the Keychain box. You'll be prompted to delete the local iCloud keychain. Confirm—the data will remain on the servers. Then re-check the box. Follow one of the procedures described in this support article to set up iCloud Keychain on an additional device. Test.

Step 2

If you still have problems, uncheck the Keychain box again and continue.

Triple-click the line below on this page to select it, then copy the text to the Clipboard by pressing the key combination command-C:

~/Library/Keychains

In the Finder, select

Go ▹ Go to Folder...

from the menu bar and paste into the box that opens by pressing command-V. You may not see what you pasted because a line break is included. Press return.

A folder named "Keychains" should open. Inside it is a subfolder with a long name similar to (but not the same as) this:

421DE5CA-D745-3AC1-91B0-CE5FC0ABA128

The above is only an example; yours will have a different name of the same general form. Drag the subfolder (not the Keychains folder) to the Trash and empty.

Restart the computer and re-enable iCloud Keychain.

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Answer 3

Inawt Author

Level 1

1 points

Nov 17, 2015 3:41 PM in response to Linc Davis

Thank you. This solved my problem (Step 1). I hope it will not come back.

Inawt

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