Backup disk not available in Time Machine with upgrade install of Mountain Lion

+1 - worked with my seagate blackarmor 220 - thanks so much for the fix!!

Cool! This works by using the IP! I ended up having to blow away my old sparsebundle but there ya go. 😉

But here's the rub, I was asked whether I wanted to Replace my original server name (bundle) with the new IP based one OR back up to both disks? I chose Replace the first time to make sure it worked and it did, I I now have a backup where I couldn't get one earlier since I upgraded to ML. The question is, can I now chose back up to both disks via the standard name and will the IP based bundle continue to work?

I'm tempted to wait until Apple releases a fix for the mess they caused before trying that out. 😉

BTW, I'm not using a Time Capsule. This is for a TM backup to a USB drive connected to another Mac.

Was having the same problem with my 2011 Air backing up to old TIme Capsule. It seems to have started the process of backing up now and this is what I have done to get it there:

A4 Full Reset of TIme Machine http://pondini.org/TM/A4.html

followed by reselecting the time machine disk in system preferences (going into system preferences / TIme Machine, click "select disk," click on the time machine disk, click "remove", then select the time machine disk again and click ok).

Good luck!

Ditto. Upgraded my summer-2011 MBA to Mountain Lion. Just purchased Apple's Time Capsule. Set up Time Machine, started the backup (with MBA plugged in and via wireless - no Ethernet plug of course), walked away and was going to let it backup for a couple of hours.

Came back an hour later. Not backing up, backup disk not available, asks me to Join the wireless network, which it then does automatically, and then I have to start backup again.

Maybe an issue with ML stopping WiFi on sleep, even while backing up to TM???

I had same issues with a usb disc connected through an airport extreme.
I could mount the old backups and disc is there. None of the workarounds helped.

After renaming the airport, the disc is found again and backup works.

renaming and reselecting the disc I might add

I would add that once I got Time Machine to connect to the disk and start backing up, after 12 hours it had only backed up 6 Gb. So I stopped the backup and repaired the backup disk image using disk utility and my new Thunderbolt-Ethernet adapter cable. That took about 1.5 hours. After that I repeated the steps I outlined before to connect to the backup disk. The backup completed much faster and everything seems to be ok now.

Thank you, this worked for me. Now to getting global access with my NAS.

God Bless,

Terence

Any1 else get a call from an Apple Tech requesting to Terminal ino my Mac to connect Time Machine Data?

Following your additional steps solved this problem with my NAS 220.

Thanks!

Thanks for the resolution on this issue. I'm new to Mac products with the new MBA and find it unbelievable everyone is so accepting of this work around versus expecting a fix from Apple. I thought these products "just work"?

Ok, I had the same problem (backup disk not available) and I tried what was suggested on this post. Didn't work for me. So what I did is;

True the Airport Utility I did an update of my Time Capsule (it was needed by the system). My time capsule software was not the latest one.

That created a reset / restart of the time capsule.

I went into time machine and just deleted the hard drive used by time machine.

Turn off time machine.

Waited few second.

Turn time machine back on.

Selected the time capsule which was still showing my backup previous ML.

I push for a backup now and everything was working good.

Since then everything is working

Hi guys,

I'm slightly confused as to what the

afp://10.0.1.100/

means

I have the IP address but just the #'s and periods not really sure what the rest of this is though...

Thanks and I really need an answer.

DO NOT TRY THIS, I just realize that I lost all the previous back up.

gunsmas wrote:

Ok, I had the same problem (backup disk not available) and I tried what was suggested on this post. Didn't work for me. So what I did is;

True the Airport Utility I did an update of my Time Capsule (it was needed by the system). My time capsule software was not the latest one.

That created a reset / restart of the time capsule.

I went into time machine and just deleted the hard drive used by time machine.

Turn off time machine.

Waited few second.

Turn time machine back on.

Selected the time capsule which was still showing my backup previous ML.

I push for a backup now and everything was working good.

Since then everything is working

This worked for me....Thank you very much. I actually only had to update the firmware in the Airport utility for TM, and it did a self restart, and now works great...never had to delete previous backups etc. Thanks again for the simple tip