Time Machine - Time Capsule Username/ Password Error

Hey all,
I have this intermittent problem...It seems when I am not using my computer and Time Machine goes to do a backup it gets the following error:
Time Machine could not complete the backup.
The network backup disk could not be accessed because there was a problem with the network username or password.
I am running a new Time Capsule and a Mac Mini. I have tried both wired and wireless connections. I have tried all three types of username/ password options on the Time Capsule. I have even turned on guest access and access over the Internet via Bonjour.
Still it seems when I am not at the computer it gets this error. I am not logging out and the power option is set to never have the MAC go to sleep.
If I click ok on the error box and then go to Time Machine and click Back Up Now it will work (sometimes after two or three attempts). Time Capsule is running 7.5.1 software.
I have also tried deleting all reference to the Time Capsule in my password keychain and re-authenticated.
Any ideas?

Last night I reset the Time Capsule to factory defaults (erased the data) and re-configured the Time Capsule again. The Time Machine initial backup completed in about three hours and all the hourly backups after that completed just fine. So it looks like it was working.
When I initially installed the Time Capsule a week ago there was a software update available that I did. What I think happened is it never completely upgraded some how. For instance, now in my first configuration screen it shows a MAC address for both the 5ghz and the 2.4ghz networks, that was never there before. A couple of other slight screen changes are there now. So I am thinking my software update wasn't loaded properly and the reset got it all fixed....
So it looks like I am good to go now.
Thanks for the input.
Alan

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We haven't seen report of problem with 6584 for a while. It generally means a corrupted backup. You need to do a verify of the back.
See A5 here. http://pondini.org/TM/Troubleshooting.html
This will take a very very long time if the backup has almost filled the TC.. so at least use ethernet connection.
You do have a problem.. the formatted capacity of a 2TB disk is 1.8TB.. If you have used up 1.79TB then sorry but you really need to erase the TC and start over.
The TM can fill up huge disks if you use parallels or dropbox or any dual boot system that has a virtual disk file.. TM will backup 20GB for every 1KB change. That file is hidden btw so you might not see it but I assure you it will chew up space.
I don't know what you mean by computer having only 4GB. That would make it rather ancient.. Surely even smallest SSD must be 64 or 128GB.

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You’re running an outdated copy of Safari on your Desktop. That won’t work.
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The possiblility of recovery according to pondini is remote.. You history is history.. You have no choice but to start over.
I would actually recommend an erase of the TC.. and use the one pass low level format to ensure the drive itself is still good.
Read over Pondini's reply again as he has already answered your questions.
eg
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ie it is possible but unlikely as they are damaged beyond recovery.. You can run a repair and see if it fixes it.. I would consider building a sand castle to hold back a tidal wave would be equally useful use of your time. If you want decent backups.
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2. Or use local backup disk.. not network. A local disk is cheaper, faster and more reliable than network.
3. Use Crashplan or CCC or Chronosync etc. Keep a disk image of whatever setup you want.. and do not add incrementals to it. They become less reliable when you add more than an image. Use a backup that can produce a bootable image.. and you will then have the ability to recover your computer.. TM can then add the bits you are missing.
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I have had a never ending series of Time Machine/Time Capsule issues. There's little to configure, so there's not much I could be doing wrong.
One thing I have especially noticed, is that Time Machine is interfering with iTunes. iTunes has frozen for a time or locked up when Time Machine is backing up.
Another problem I have seen is the console log flooded with some sort of waiting for index error. Yet another are messages like -
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A Macbook/Time Machine/Time Capsule epic - still in progress. Please help!

I'll try and keep this to the point.
I decided to upgrade my Macbook's 160GB Hitachi hard drive to a 500GB Samsung model. I also have a 500GB Time Capsule that has has an ongoing Time Machine backup going back to June 13, 2008.
I figured that I would change out the HD, then use the 'restore' function in Time Machine to bring the system back to where I left it. I figured that's exactly why I purchased Time Capsule in the first place.
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It was clearly never going to finish, at least not this year.
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OK, Time Capsule's Time Machine backup file is now toast. End of story.
Here's my question: I figure my next step is to figure out whether the HD in Time Capsule is faulty or whether the backup file itself is corrupt. I'm now 'zero fill' erasing the TC's HD. Does this give you a surefire way to tell that the drive is in good condition? If it fails, I guess it's under warranty. If not, I'll start a new backup from scratch (I don't see what else there is to do at this stage, frankly) and try to restore that and see how that goes.
Does anyone know what an 'error -36' is, anyway? Can anyone tell me if I've missed something, or some reason why this may not have worked as well as it was supposed to? Or anything that I should do next that I may not have thought of?
Thanks so much,
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I will remember to try to repair the TC disk via Disk Utility next time - I didn't even know you could do that until now! Thanks for that. In that case, I agree that I wiped the drive, because it would have been a great opportunity to try out the repair function and see if it could have made it work.
Well, the good news is that I have succeeded with my original intention, which was to replace my internal HD with a larger one, using Time Machine/Time Capsule to bring everything back. It worked perfectly, and I now have a Macbook with a 500GB drive. Awesome! By the way, I can recommend the Samsung drive if anyone is thinking of making the switch. So far, excellent performance, near-silent operation, and loads of storage space - for now!
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After the erasure, I found that the backup would not start, and everything about the Mac was sluggish! I cycled the power on the Time Capsule, and everything was like new once again. I restarted the backup and without delay, it started backing up - and fast.
Once this completed, I did a restore, and the estimated time was 8 hours. Big improvement from 24! After just 80 mins, it had restored 25% of the system - and this is wirelessly (using 'N')! Clearly, everything had become jammed up and during my previous restore attempt, it pretty much ground to a halt.
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Thanks for the responses again, and hopefully this post may help someone in the future.

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Muizen wrote:
Thank you WZZZ.
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I updated to Snow Leopard and still got this problem all the way up to 10.6.8.
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****, I would have loved it to be that !!!

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