Sierra Time Machine / Time Capsule problem

Question

Level 1

9 points

Sierra Time Machine / Time Capsule problem

After installing Sierra, I'm unable to use Time Machine to a Time Capsule.

There was a MacBook Air with two bootable partitions. The Macintosh HD partition had a Yosemite system and the "Second" partition had an El Capitan partition that was created by a clean install and then allowing Migration Assistant to copy over from Macintosh HD all accounts, settings, networks, and other files. Both partitions were being backed up by Time Machine to a Time Capsule. The Macintosh HD partition was erased and Sierra was installed on Macintosh HD and Migration Assistant was allowed to copy over from Second all accounts, settings, networks, and other files.

Time machine has not been working since. It gets the error message "Backup Disk Not Available." However, using the Finder, I can mount the Time Capsule, open the sparsebundle and see all the individual backups. Since I had erased Macintosh HD, I went through the steps at http://pondini.org/TM/B6.html to "reconnect to my backups". That didn't make any difference (probably because Time Machine isn't really seeing the the sparsebundle on the Time Capsule drive, even though the Finder has no trouble opening it).

I then tried to re-select the Time Capsule as the backup disk. It asks for a password. I give the password and after a little while it comes up with the error message: Keychain error -25299 occurred while creating a System Keychain entry for the username “<name>” and URL “afp://<name>@2%20Tb%20Time%20Capsule._afpovertcp._tcp.local./Data”.

(where <name> is the name of the logged in user) I get the same error message independent of whether or not the logged in user is an administrator. Despite saying that it wasn't able to create an entry in the System Keychain, Keychain Access shows that there is an entry with the correct password. Also, despite being unable to select the Time Capsule as the backup disk, it mounted and left on the desktop the Data folder (containing the sparsebundle) from the Time Capsule.

Any suggestions?

Posted on Sep 25, 2016 4:22 PM

Reply

Answer 1

AxelvdS

Level 1

4 points

Jan 10, 2017 11:18 PM in response to D M R

Hi,

I struggled with this same problem and was able to resolve it.

The entry is already in the Keychain under System but with spaces instead of the %20 as per the error message. If you copy the keychain value with the %20 (afp://<name>@2%20Tb%20Time%20Capsule._afpovertcp._tcp.local./Data) and paste it to replace the existing entry (afp://<name>@2 Tb Time Capsule._afpovertcp._tcp.local./Data) then the error doesn't come back.

At least that worked for me.

Reply

Answer 2

Sep 25, 2016 4:50 PM in response to D M R

You are the second one today with keychain errors.

time machine over network not connnecting

Sierra being a new OS is going to have some bugs.. but I think the way you have done this setup is problematic.

Effectively you now have two partitions with different OS but they will have identical computer names (migration carries over the name). And it might also mess up the UUID of the disk.

I am guessing but I would say

1. Change the computer name.

2. Start a new backup.. do not try and link to the existing backup.

3. If you still have no success delete the TM plist (A4 Pondini) and reconfigure it.

No luck post back.

Reply

Answer 3

D M R Author

Level 1

9 points

Oct 29, 2016 12:27 AM in response to D M R

Upgrading from macOS Sierra 10.12 to 10.12.1 seems to have fixed the keychain error message -25299 (which was my main problem).

Reply