How do I erase and reformat an Apple Time Capsule?

I just completely reformatted and restored my laptop and am now hitting the error "This backup is too large for the backup volume. The backup requires 95.9 GB but only 63.2 are available" when I try to use Time Machine to back up to my Apple Time Capsule network backup device. This stinks: I need to be able to keep backing things up!

I talked with a few people and they suggest that the easiest solution is to wipe the Time Capsule drive and start over. How do I do that?

Dave's Answer:

In a curious twist of fate, this question came in just as I too was seeing the same problem, having recently upgraded the hard drive in my MacBook Pro to a huge 500GB device. My Time Capsule is also a 500GB drive (yeah, it's too small! That's a separate issue) and out of nowhere Time Machine stopped backing up and kept complaining that it needed a bigger space for its incremental than I had available.

Apparently while it deletes older backups to keep things in rotation, if you have big enough blocks, it can get into a situation where it's "stuck" and can't succeed at backing up the current increment. Not so good, and it's also not so good that Apple just leaves us hanging out to dry with no user-friendly path to solve the problem. For example, if it prompted me with "Backup device has insufficient space for normal operation. If you delete all of your hourly incremental backups for this system, however, I can proceed. Would you like to do that?"

Instead we need to do it ourselves. And here's how you do that...

You need to start with Applications --> Utilities --> Airport Utility. It should launch and immediately find your Time Capsule:

As you can see, mine is called "Time Tunnel" (a nod to a cheesy old TV show, if you must know). Click on "Manual Setup" on the bottom and you'll find that there's a ton you can configure from here:

That gives you a summary of the device. What you want to do is click on "Disks" on the top bar. Now you'll see what's going on with your disk:

As usual, you don't get access to the full size of the drive. In this case, my 500GB Time Capsule only gives me 465.8GB of actual usable space. I'm ready to proceed with the digital guillotine so I click on "Erase..." to proceed.

airport utility manual setup disks erase

It asks me if I really want to do this, really want to delete all of my old backup data. I do, but I don't want to rename the device (this is the internal name: notice that "Time Tunnel" shows up on other screenshots).

I can use the quick erase if I'm going to reuse it, but if you're selling it or are otherwise concerned about the recoverability of backup data, there are some other erase options you can pick:

airport utility manual setup disks erase security

I suggest "Quick Erase" as the others are pretty darn slow, like overnight slow, and if you don't need to worry about it, well, why spend the time?

Once you're ready, click on "Erase..." again and you'll have yet another chance to change your mind:

airport utility manual setup disks erase confirm

Since I didn't disconnect myself, the device thinks I'm still connected to it, so I now see:

No worries, that's what I want to have happen. Click "OK".

Meanwhile, back in the Airport Utility window, you should see a progress bar:

Once that erase process is done, it'll restart the device and when you go back to "Disks" in Airport Utility, you should now see that all of the disk space is available:

Start new backups - but as with all first-time backups, connect via Ethernet for best performance, not wifi!! - and after a few hours you should be good to go.

Hope that helps. Next up for me? How to upgrade the drive inside my Time Machine...

Categorized: Mac OS X Help (Article 8907, Written by Dave Taylor)
Tagged: apple time capsule, apple time machine, disk management, mac os x, network backups
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Comments

Dave,

We bought a used unit and tripped right into this situation. Can't thank you enough for taking the tim to produce this clear and concise guide.

Posted by: Jim Reinis at September 14, 2009 9:17 PM

I just purchased a 2TB Time Capsule. I already had a 500MB one and was backing up 3 systems on that 500MB Time Capsule. 1 MacBook Pro, 1 MacBook Air and a Mac desktop. I was running out of space and therefore decided to invest in the 2TB.

The idea is that I want to back up the MacBooks on the existing 500MB Capsule and the Mac Desktop on the new 2TB (Movies, pictures, music etc. etc. etc.)

All went well and I now have this successfully set up.

Here is the question though: The 500MB drive still shows the backup image of the Mac which I have moved to the 2TB drive. How do I remove this backup image off of the 500MB Time Capsule without removing the other 2 backup images?

Posted by: Henri at September 15, 2009 1:34 PM

Hi, I'm wondering if you might know whether I can format an Iomega home media network hard drive to act like a time capsule. I've been looking around and can't find anything on it. Thanks

Posted by: robert dunn at January 25, 2010 5:13 AM

Robert, I think you should go and read this discussion on the Apple.com support area:

http://discussions.apple.com/thread.jspa?threadID=2233230

Hope that's helpful!

Posted by: Dave Taylor at January 25, 2010 7:01 AM

Thank you, that was very helpful and easy enough to complete!

Posted by: Madalina at April 1, 2010 8:51 AM

Thanks for this information! It worked perfectly and was very easy to follow. My time capsule was behaving like an expensive paper weight so I hope that by erasing it I can start again and get it right.

Posted by: Hel in Beijing at April 1, 2010 9:28 PM

Fantastic - really helpful.
I have a question - i back up three computers to my time capsule. i have just erased it as per your excellent help. i noticed that i had two sparse bundles with the same name - because two of the machines i am backing up have the same name - idiot - i know. how do i change this now i am starting afresh. where does time machine get the names from ???

Posted by: hamish at July 12, 2010 8:07 AM

hamish, you want to go to System Preferences -> Sharing and you'll see your computer name right there at the top of the window. :-)

Posted by: Dave Taylor at July 14, 2010 8:10 AM

Very clear instructions! The above info fixed my time capsule problems. I cannot thank you enough!

Posted by: Nate at July 28, 2010 6:04 PM

Thanks Dave,

This really made my day. I have been looking for this answer for 2 days now.

Willem

Posted by: Willem at October 31, 2010 6:12 AM

Thank you, Dave.

Worked like a charm!

Posted by: slevan at November 13, 2010 12:37 PM

Thank you very much, very helpful.. perfect HOW TO... worked the first time.

Posted by: Riley at November 22, 2010 12:37 AM

THANK YOU, THANK YOU...

Thank you!!!

Posted by: Kevin at December 15, 2010 5:04 AM

Thanks Dave. Very good clear explanations. Why the AppleCare Protection help desk people couldn't help solve my problem as simply as this, I don't know. Their diagnosis was that my Time Caspule HDD had an error, and they had advised me to take it into a service center to get repaired (just 25 days out of warranty too!) Your solution has saved me a lot of time and expense. Thank you!

Posted by: Michael 'MC' Carter at December 21, 2010 11:01 PM

Thank you, you made it so easy for me. XD

Posted by: Steven Xue at February 27, 2011 11:09 PM

Solved! Thanxx!

Posted by: iMixx at March 31, 2011 8:07 PM

Dave

You way you have explained the Time Machine Erase procedure was brilliant. Super clear (& funny!)

I bought you a chai as a way of saying thanks buddy

Posted by: Pete Miller at April 15, 2011 7:06 PM

Great advice!

Posted by: Mark van den Brand at May 16, 2011 12:48 PM

I have a problem with time machine - it seems to stop backing up at about 16GB and hangs also locking up my Mac. I tried clearing the disc but still have the same problem. Anyone have any idea's what the cause is and how to correct.

Posted by: Chas Couchman at May 20, 2011 6:20 AM

Awesome! Your directions were very clear, confidence inspiring, and accurate. My time capsule is now behaving again. Thanks so much!

Posted by: Jimmy at July 31, 2011 4:31 PM

Help! My grandchildren came for a visit and used my Mac ! Everything got backed up... like their movies,web searches, and you tube! How can i get into my iOMEGA External hard drive and my time capsule and erase the data?Too much space was used! I use my computer ONLY to preserve picture files or my personal email.

Posted by: madelyn at August 7, 2011 9:01 AM

Madelyn, I've been chewing on this one and the only solution I have for you to recover the space eaten up on your backup device is to wipe it clean and start over. The problem, of course, is that you lose the backups of YOUR files in the process. But there's no tool I know that lets you dig into the Tame Machine backup (which is in a weird "sparse data" format) and free up specific items. Wish I had better news...

Posted by: Dave Taylor at August 7, 2011 12:16 PM

From Denmark. What a happiness to see all the solutions. Please help me aswell.
I have 2 T Time Capsule and suddently it will not make safetycopies. I get a notice like this:
Discpicture to safetycopy "volumes/lageret - 1/imac.sparsebundle"
could not open (error - 1)
It makes backup, but allmost finished it stops and I get this message.
I don't know what to do.

Posted by: Preben Harder at August 14, 2011 9:48 AM

Zero out data is real slow, at least 26 hours ( maybe more) on a wifi connection.

Posted by: Dick Janson at August 15, 2011 1:26 AM

solved. thank you very much

Posted by: Abdullah Wreikat at September 5, 2011 2:35 AM

Thanks Dave, It took me a week and a half of searching to come up with simple instructions. This was very clear and I was backing up in less than five minutes. Not sure why Apple isn't clearer on this topic. Anyway, many thanks for your help with this.

Best regards,

Ron

Posted by: Ron Grau at September 21, 2011 6:25 PM

Thank Dave....Great Advice!
Dazza in the UK!

Posted by: Dazza at December 7, 2011 7:07 AM

Thank you Dave for your help.
Mike

Posted by: Mike at January 1, 2012 7:59 AM

Hi there,
Yep managed to erase my TC with your very fine instructions...but now...grrr....it won't let me back up? "The back up disc is not available". I rebooted and put it back to factory settings and set it up again, to no avail.suggestions? thanks in advance!

Posted by: Shelley at January 9, 2012 11:03 AM

Thanks for the easy way to delete all the data you don't need, it was really helpful. Before I go and do it though, will it shut down my internet? I have my WiFi connected using the Time Capsule, so will erasing Time Machine backups screw up the internet until it's done?

Thanks,
Jim

Posted by: Jim at January 27, 2012 4:46 AM

Jim, the backup function and wifi function are unrelated. One shouldn't affect the other...

Posted by: Dave Taylor at January 27, 2012 9:04 AM

I have something to say, now that you mention it, but ...

I do have a lot to say, and questions of my own for that matter, but first I'd like to say thank you for all your efforts on this Web site by buying you a cup of coffee!

I do have a comment, now that you mention it!