The backup disk could not be found.

Upgraded to Mountain Lion and ...

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Time Machine error "The backup disk could not be found"

I use Time Capsule with Time Machine, Lion OS and manage to setup successfully. However after I on it for few hours, there is backup error. Time Machine error message "The backup disk could not be found." But the internet wifi is working normally.
To solve this issue I have to power off and on it again, then the disk can be detected. But after few hours same thing happen again.
Is it a hardware faulty or sometime that cause the Time Capusle harddisk to sleep after sometime?

I have this exact same problem. When I restart the Time Capsule I can then start backups normally, but it requires manual intervention. That's dissapointing because Time Machine and Time Capsule are supposed to be an automatic, worry free backup. I have to restart the Time Capsule frequently. Annoyed.

Time machine couldn't complete the backup to "GoFlexHome". The backup disk could not be found. What options do I have? I haven't backed up since October 8, 2014.

Need help fixing issue with backing up my iMac. As of October 8, 2014, time machine can no longer find my "GoFlexHome" back up disk. I think this may be when I update to Yosemite, but can't recall. I am scared to delete my backup since I don't know if that is the fix. I found this info. on-line thru Seagate, http://knowledge.seagate.com/articles/en_US/FAQ/219531en?language=en_US, but I am not sure if this will be the fix. Has anyone else experienced this issue?

Tara,
Open Disk Utility (Applications - Utilities - Disk Utility) and look to see if your TM drive can be seen. If it cannot then reset the SMC and PRAM (the SMC may need 2-3 attempts), instructions are in iMac SMC and PRAM reset.
If the drive cannot be seen after performing the resets, get another cable and re-attach and look to see if it can be seen. If it still cannot be seen, then the drive may have failed and needs to be replaced. If you have another Mac available, connect the drive to that Mac and see if it is seen on that machine or not.

The backup volume could not be found

Spent a fair amount of time on the phone with Apple last night trying to get my Macbook Air to work with Time Machine/Time Capsule.
Symptoms of my problem included Time Machine Preferences giving the error "The backup volume could not be found"
Console messages complaining about not being able to find the MAC address for machine:
(console is accessed by clicking Go -> Utilities -> Console from the Finder, and then selecting All Messages)
11/7/08 11:06:13 AM System Preferences[123] *Time Machine failed to get MAC address for machine.*
11/7/08 11:13:09 AM /System/Library/CoreServices/backupd[1603] Starting standard backup
11/7/08 11:13:09 AM /System/Library/CoreServices/backupd[1603] Network mountpoint /Volumes/Time Capsule not owned by backupd... remounting
11/7/08 11:13:09 AM kernel AFP_VFS afpfs_mount: /Volumes/Time Capsule-1, pid 1604
11/7/08 11:13:09 AM /System/Library/CoreServices/backupd[1603] Network volume mounted at: /Volumes/Time Capsule-1
11/7/08 11:13:09 AM /System/Library/CoreServices/backupd[1603] *Volume at path /Volumes/Time Capsule-1 does not appear to be the correct backup volume for this computer. (Cookies do not match)*
11/7/08 11:13:09 AM /System/Library/CoreServices/backupd[1603] Backup requested due to disk attach
11/7/08 11:13:14 AM /System/Library/CoreServices/backupd[1603] *Backup failed with error: 18*
And my only network interface was showing up as en1 (instead of en0). You can check this by using Network Utilities:
- On the Finder main menu bar click Go -> Utilities -> Network Utilities
If "Network Interface (en0)" is not an option in the drop down list under "Please select a network interface for information" (mine was showing as en1), then the following steps will probably solve your problem:
1) Enable the root user
- Open the finder
- On the Finder main menu bar click Go -> Utilities -> Directory Utility
- On the menu bar click Edit -> Enable Root User
- set a password (they suggested using the same password as is used for the main user account)
2) Login as the newly enabled root user
- Click Log Out... from the Apple menu on the main menu bar
- select "Other" at the login screen
- enter the user name "root" and the password you set in step 1
3) Drag Preferences folder to the desktop
- open the finder, and click on Macintosh HD and then Library
- drag the Preferences folder onto the desktop
4) Restart the computer
- Click Restart from the Apple menu on the main menu bar
After this, the Network utility should show "Network Interface (en0)", and Time Machine should work.

Jackson,
See this article for the reasons why you see "Time Capsule-1 does not appear to be the right volume..."
[http://discussions.apple.com/thread.jspa?messageID=8116036&#8116036]
As for the error message you are getting, here are several reasons why you would see this message...
*_"Backup Volume Could Not Be Found"_*
First, it is important to distinguish this error message from another, similar Time Machine error that states, “The backup volume could not be mounted”. This is important as the causes and cures for these two errors can be very different.
*Reselect Your Time Machine Disk*
(http://support.apple.com/kb/TS1329)
In the Finder, go up to the "Go" menu and select "Connect to Server".
Click the "Browse" button at the dialogue box.
In the Network window that opens, do you see your TM drive?
Double click it to mount the drive.
Now let's try to reselect it for Time Machine use.
Go to System Preferences --> Time Machine.
Click the "Change Disk..." button.
Select "None" and click "Stop Backing Up".
Now click "Choose Backup Disk" and reselect your drive again.
Close System Preferences and try backing-up again.
On the other hand, does your Time Machine drive NOT appear at all? Is it appearing on your desktop? If it is still connected try disconnecting the cable, waiting a few seconds and then reconnecting the cable. Does the drive mount on the desktop? Try initiating a backup now.
*Disk Fails to Wake From Sleep*
“If your external HD has a sleep function that does not wake for Time Machine backups. Time Machine will alert you that "The backup volume could not be found", and backups will not be made.” [http://support.apple.com/kb/TS1337]
*3rd-Party Disk Utilities* #
Many external hard disks come with software for maintaining/monitoring hard disk activities. It may have come on a separate CD or been installed on the drive itself. If these programs have been installed they may interfere with Time Machine backups, generate erratic behavior, or cause the drive to ‘disappear’ altogether.
You may never know these applications are there as they may be running in the background. Go to System preferences --> Accounts. Select your account in the pane on the left. Click “Login Items”. Are there any items listed there that might refer to hard disk utilities. If so remove them using the “-” button at the bottom.
*Delete Time Machine Preference .plist*
It may be that the preference list that stores the name of your designated backup disk has become corrupted.
Go to --> Macintosh HD / Library / Preferences (Note: NOT Home / Library / Preferences).
Drag the .plist file labeled,
com.apple.TimeMachine.plist
to the root level of your Macs’ hard drive.
Reboot your computer.
This .plist file is automatically recreated at startup if it is missing.
Now try choosing the external HD in the TM Prefs for backup.
*Time Capsule Has a Long Name*
“When using your Time Capsule for Time Machine backups in Mac OS X 10.5 Leopard or later, the Time Capsule backup volume may not mount and Time Machine may not be able to back up to it. This alert may appear: "Backup volume cannot be found". This can happen if the Time Capsule disk has a long name. [http://support.apple.com/kb/HT1170]
Open AirPort Utility (in /Applications/Utilities).
Click your Time Capsule's icon.
Click "Manual Setup".
Enter the password for the Time Capsule if prompted.
Click the Disks icon.
Highlight the volume name that appears under "Time Capsule Disk".
In the Name field, enter a name for the volume that is less than 27 characters long.
Click Update.
After Time Capsule restarts, on the Mac(s)using Time Machine, open Time Machine preferences and reselect the Time Capsule volume.”
Let us know if any of these suggestions help.
Cheers!

Everything was OK - now have "The backup volume could not be found" error

Setup:
* MacBook Air
* MacBook 10.5.5
* Mac Mini with external hard drive with 2 partitions, one of which is called "Time Machine", 10.5.5
What was working:
MacBook Air and MacBook would backup with Time Machine over wireless connection to .sparseimage files on the "Time Machine" volume connected to the Mac Mini.
Change:
Had to give the MacBook Air back to my old employer, so I "merged" the MacBook Air onto the MacBook (the merge was somewhat convoluted, and unrelated to my issue I think: I used SuperDuper to copy the MacBook Air hard drive onto a new SATA notebook drive. Then I installed that drive in the MacBook. Then I used Migration Assistant to copy the user from the original MacBook SATA drive onto the new drive in the MacBook. Now I have two users on the MacBook, whereas before I had one use on each of two computers).
Symptom:
Now I cannot use Time Machine to backup the MacBook to the "Time Machine" volume. Everything I've tried causes Time Machine to briefly "prepare" the backup, then return the error "The backup volume could not be found". Things I've tried:
* Mounting the volume "Time Machine" on the MacBook, under either user, works fine - I can write, read, and delete from the volume.
* Deleting the old .sparseimage backup files from the "Time Machine" volume.
* Erasing the "Time Machine" volume with Disk Utility on the Mac Mini.
* Using "Change Disk..." in Time Machine to re-select the volume "Time Machine"
* Using "Change Disk..." in Time Machine to select None, then restarting, then re-selecting the volume "Time Machine"
* Making the volume "Time Machine" read/write by guests, then connecting to it from the MacBook as a guest instead of as an admin user.
* Repairing permissions and/or repairing disks using Disk Utility on all applicable volumes.
* Tried all of the above under both users on the MacBook (both of whom are Admin users)
None of these things have worked, they all exhibit the same symptom when I manually start a time machine, or when I wait for Time Machine to automatically start the backup.
Any ideas of what I can try next?

Consider these reasons for this error...
*_"Backup Volume Could Not Be Found"_*
First, it is important to distinguish this error message from another, similar Time Machine error that states, “The backup volume could not be mounted”. This is important as the causes and cures for these two errors can be very different.
*Reselect Your Time Machine Disk*
(http://support.apple.com/kb/TS1329)
In the Finder, go up to the "Go" menu and select "Connect to Server".
Click the "Browse" button at the dialogue box.
In the Network window that opens, do you see your TM drive?
Double click it to mount the drive.
Now let's try to reselect it for Time Machine use.
Go to System Preferences --> Time Machine.
Click the "Change Disk..." button.
Select "None" and click "Stop Backing Up".
Now click "Choose Backup Disk" and reselect your drive again.
Close System Preferences and try backing-up again.
On the other hand, does your Time Machine drive NOT appear at all? Is it appearing on your desktop? If it is still connected try disconnecting the cable, waiting a few seconds and then reconnecting the cable. Does the drive mount on the desktop? Try initiating a backup now.
*Disk Fails to Wake From Sleep*
“If your external HD has a sleep function that does not wake for Time Machine backups. Time Machine will alert you that "The backup volume could not be found", and backups will not be made.” (http://support.apple.com/kb/TS1337)
*3rd-Party Disk Utilities* #
Many external hard disks come with software for maintaining/monitoring hard disk activities. It may have come on a separate CD or been installed on the drive itself. If these programs have been installed they may interfere with Time Machine backups, generate erratic behavior, or cause the drive to ‘disappear’ altogether.
You may never know these applications are there as they may be running in the background. Go to System preferences --> Accounts. Select your account in the pane on the left. Click “Login Items”. Are there any items listed there that might refer to hard disk utilities. If so remove them using the “-” button at the bottom.
*Time Capsule Has a Long Name*
“When using your Time Capsule for Time Machine backups in Mac OS X 10.5 Leopard or later, the Time Capsule backup volume may not mount and Time Machine may not be able to back up to it. This alert may appear: "Backup volume cannot be found". This can happen if the Time Capsule disk has a long name. [http://support.apple.com/kb/HT1170]
Open AirPort Utility (in /Applications/Utilities).
Click your Time Capsule's icon.
Click "Manual Setup".
Enter the password for the Time Capsule if prompted.
Click the Disks icon.
Highlight the volume name that appears under "Time Capsule Disk".
In the Name field, enter a name for the volume that is less than 27 characters long.
Click Update.
After Time Capsule restarts, on the Mac(s)using Time Machine, open Time Machine preferences and reselect the Time Capsule volume.”
Let us know if any of these suggestions help.
Cheers!
Message was edited by: Glenn Carter

ERROR 18 : "The backup volume could not be found."

My time machine has been relatively smooth sailing...until today. After accidentally cutting power to backup drive, I power it back up, shows on desktop, shows in Time Machine...but every backup attempt fails with "The backup volume could not be found. error: 18".
I'm confused because it's found the volume in it's source panel. Any help greatly appreciated.
The following are relevant notes from CONSOLE:
1/16/08 5:13:10 PM fseventsd[44] event logs in /Volumes/BACKUP 1/.fseventsd out of sync with volume. destroying old logs. (16998 0 17446)
1/16/08 5:13:10 PM fseventsd[44] log dir: /Volumes/BACKUP 1/.fseventsd getting new uuid: 09DD4896-F974-43F3-ACE4-3E622ED85B0D
1/16/08 5:13:10 PM /System/Library/CoreServices/backupd[5943] Backup requested due to disk attach
1/16/08 5:13:10 PM /System/Library/CoreServices/backupd[5943] Starting standard backup
1/16/08 5:13:11 PM /System/Library/CoreServices/backupd[5943] Volume at path /Volumes/BACKUP 1 does not appear to be the correct backup volume for this computer.
1/16/08 5:13:11 PM /System/Library/CoreServices/backupd[5943] Backup failed with error: 18
1/16/08 5:13:50 PM System Preferences[5772] Failed to create remote cookie file at path: /Volumes/BACKUP 1/.001b6399417e
1/16/08 5:15:53 PM /System/Library/CoreServices/backupd[6134] Backup requested by user
1/16/08 5:15:53 PM /System/Library/CoreServices/backupd[6134] Starting standard backup
1/16/08 5:15:53 PM /System/Library/CoreServices/backupd[6134] Volume at path /Volumes/BACKUP 1 does not appear to be the correct backup volume for this computer.
1/16/08 5:15:53 PM /System/Library/CoreServices/backupd[6134] Backup failed with error: 18

I tried the "INFO" button in Disk Utility and got the following (note permissions):
Name : BACKUP
Type : Volume
Disk Identifier : disk1s3
Mount Point : /Volumes/BACKUP 1
File System : Mac OS Extended (Journaled)
Connection Bus : FireWire
Device Tree : /PCI0/PCIB@1E/FRWR@3/node@d04b7a1902c345/sbp-2@c000/@0:3
Writable : Yes
Universal Unique Identifier : 88A2942E-7431-3CA4-9600-91B7B06C88BD
Capacity : 931.4 GB (1,000,081,408,000 Bytes)
Free Space : 720.2 GB (773,297,737,728 Bytes)
Used : 211.2 GB (226,783,670,272 Bytes)
Number of Files : 972,778
Number of Folders : 224,223
Owners Enabled : Yes
Can Turn Owners Off : Yes
Can Repair Permissions : No
Can Be Verified : Yes
Can Be Repaired : Yes
Can Be Formatted : Yes
Bootable : Yes
Supports Journaling : Yes
Journaled : Yes
Disk Number : 1
Partition Number : 3
I will post in that forum. thank you!

Time Capsule "backup disk could not be found"

I occaisonally receive an error message on my Macbook Pro and iMac, both running OS 10.8 that my time capsule "backup disk could not be found." I can access the Time Capsule with Airport Utility, can see my backups in Time Capsule-it just won't back up. It doesn't matter whether I am connected via wifi or ethernet cable. I have had to basically disconnect and then go through a complete backup when this happens, which kind of makes Time Capsule useless for a real backup plan Any suggestions?

I recently came accross an instruction to reduce the number of characters in the Time Capusle backup disk name. After a year of having to restart my Tiem Capsule to get my MacBook Pro to backup, it now seems to do so consistently.

Time Machine: The backup volume could not be found?

I keep getting the message "The backup volume could not be found" when I try to back up my Macbook Pro using an external Lacie USB harddrive. I have tried reformatting the harddrive, and restartet the computer. The external harddrive works normal in Finder, I am able to write and read it, but Time Machine still get this error message. Can anyone help me here?
When I look in the console log, it sais: Volume at path /Volumes/MBP Backup does not appear to be the correct backup volume for this computer. (Cookies do not match)
Where can I delete this cookies?

There is a Time Machine preferences file at
<your startup drive root>/Library/Preferences/com.apple.TimeMachine.plist
Note: This is be main Library folder, not the one in your user folder.
You might try moving that to the Desktop so that the system creates a new one.

Backups failing with error 19: the backup disk could not be resolved, or there was a problem mounting it

Hello all,
Doubt this issue relates to a recent and ugly issue but sharing anyways (resolved thanks to a user here: LaPastenague)
Time Capsule won't backup if Modem (Motorola SB6121) attached
This was on Feb 10th resolved. Few days later I upgraded to Yosemite. Backups were working fine since.
Yesterday I happen to notice my last backup was 5 days ago. I looked in the console logs and saw:
2/25/15 3:55:06.127 PM com.apple.backupd[2777]: Attempting to mount network destination URL: afp://Paul;AUTH=SRP@Time%20Capsule._afpovertcp._tcp.local./Data
2/25/15 3:55:17.778 PM com.apple.backupd[2777]: NAConnectToServerSync failed with error: 2 (No such file or directory) for url: afp://Paul;AUTH=SRP@Time%20Capsule._afpovertcp._tcp.local./Data
2/25/15 3:55:17.792 PM com.apple.backupd[2777]: Backup failed with error 19: The backup disk could not be resolved, or there was a problem mounting it.
2/25/15 3:57:18.808 PM com.apple.prefs.backup.remoteservice[2021]: Attempt to use XPC with a MachService that has HideUntilCheckIn set. This will result in unpredictable behavior: com.apple.backupd.status.xpc
I called Apple. Their front line was clueless. He suggested resetting the TC (latest "tower" model btw") which then a backup kicked off YEAH
But the next hour it failed
Called Apple again, this time to Sr Advisor. He suggested factory reset of the TC and set up again. Also first backup worked then rest failed
Third call to Apple useless also. He was asking questions I didn't feel relevant. He also was asking me to reset the TC which I told him was done 2 hours prior. He asked me to reboot which I could NOT at that time.
I begged him to collect data to submit to engineering, which will take days to get a reply.
So I thought I would throw this out to the community....
TC Is NEW (replaced from last issue). Mac is 8 months old (iMac 27"), Os is Yosemite, TC also new (latest model)
Thanks...

Yosemite is problematic on two fronts.. Networking and Time Machine.. so the combo of doing both with a Time Capsule is like bugs on bugs.
Here is my standard list.. but your problem maybe difficult to resolve.. and my suggestion is simple.. until Apple get their act together and fix TM.. buy Carbon Copy Cloner and use that for your backup. It is solid and reliable.. even better if you use USB drive plugged into the computer and do a bootable clone.. because then you have a backup that is able to be tested for full functionality 2min after the end of the backup.
This also starts from a factory reset.. but the reason for it is to change the configuration which is much more easily handled with factory reset to begin.. the instructions are there.. because this is my standard reply.. this is not uncommon!!
Factory reset universal
Power off the TC.. ie pull the power cord or power off at the wall.. wait 10sec.. hold in the reset button.. be gentle.. power on again still holding in reset.. and keep holding it in for another 10sec. You may need some help as it is hard to both hold in reset and apply power. It will show success by rapidly blinking the front led. Release the reset.. and wait a couple of min for the TC to reset and come back with factory settings. If the front LED doesn’t blink rapidly you missed it and simply try again. The reset is fairly fragile in these.. press it so you feel it just click and no more.. I have seen people bend the lever or even break it. I use a toothpick as tool.
N.B. None of your files on the hard disk of the TC are deleted.. this simply clears out the router settings of the TC.
Setup the TC again.
ie Start from a factory reset. No files are lost on the hard disk doing this.
Then redo the setup from the computer with Yosemite.
1. Use very short names.. NOT APPLE RECOMMENDED names. No spaces and pure alphanumerics.
eg TCgen5 and TCwifi for basestation and wireless respectively.
Even better if the issue is more wireless use TC24ghz and TC5ghz with fixed channels as this also seems to help stop the nonsense. But this can be tried in the second round.
2. Use all passwords that also comply but can be a bit longer. ie 8-20 characters mixed case and numbers.. no non-alphanumerics.
3. Ensure the TC always takes the same IP address.. you will need to do this on the main router using dhcp reservation.. or a bit more complex setup using static IP in the TC. But this is important.. having IP drift all over the place when Yosemite cannot remember its own name for 5 min after a reboot makes for poor networking. If the TC is main router it will not be an issue.
4. Check your share name on the computer is not changing.. make sure it also complies with the above.. short no spaces and pure alphanumeric.. but this change will mess up your TM backup.. so be prepared to do a new full backup. Sorry.. keep this one for second round if you want to avoid a new backup.
5. Mount the TC disk in the computer manually.
In Finder, Go, Connect to server from the top menu,
Type in SMB://192.168.0.254 (or whatever the TC ip is which you have now made static. As a router by default it is 10.0.1.1 and I encourage people to stick with that unless you know what you are doing).
You can use name.. SMB://TCgen5.local where you replace TCgen5 with your TC name.. local is the default domain of the TC and doesn't change.
However names are not so easy as IP address.. nor as reliable. At least not in Yosemite they aren't. The domain can also be an issue if you are not plugged or wireless directly to the TC.
6. Make sure IPv6 is set to link-local only in the computer. For example wireless open the network preferences, wireless and advanced / TCP/IP.. and fix the IPv6. to link-local only.
There is a lot more jiggery pokery you can try but the above is a good start.. if you find it still unreliable.. don't be surprised.
You might need to do some more work on the Mac itself. eg Reset the PRAM.. has helped some people. Clean install of the OS is also helpful if you upgrade installed.
Tell us how you go.
Someone posted a solution.. See this thread.
Macbook can't find Time Capsule anymore
Start from the bottom and work up.. What I list here is good network practice changes but I have avoided Yosemites bug heaven.
This user has had success and a few others as well.
RáNdÓm GéÉzÁ
Yosemite has serious DNS bug in the networking application.. here is the lets say more arcane method of fixing it by doing a network transplant from mavericks.
http://arstechnica.com/apple/2015/01/why-dns-in-os-x-10-10-is-broken-and-what-yo u-can-do-to-fix-it/

Time machine has stopped working - 'the backup volume could not be found'

i'm not sure what happened, but my macbook pro hasn't been able to backup to my time machine for the past few weeks. i get a 'delayed' message, then in time machine prefs it says 'the backup volume could not be found.' i can manually mount the backup image, but it still won't backup. my wife's 12" powerbook is backing up perfectly. we both have 10.5.4. i was having the problem before the 7.3.2 firmware update, so that doesn't seem to be the cause. has this happened to anyone else? could my computer somehow lost track if the backup? is there prefs that can be trashed? i don't mind losing my old backups if i need to start over, but i can't figure out how to force it to backup because i keep getting the 'backup volume can't be found' no matter what i do.
my setup: dsl modem into time machine / my macbook pro, my wife's powermac 12", and our apple tv are the only clients.

There is a Time Machine preferences file at
<your startup drive root>/Library/Preferences/com.apple.TimeMachine.plist
Note: This is be main Library folder, not the one in your user folder.
You might try moving that to the Desktop so that the system creates a new one.

The required disk could not be found.

Attempting to write to the disk "iPod" failed. The disk could not be read from or written to.
The iPod "iPod" could not be synced. The required disk could not be found.
Why is this happening? I've tried just about EVERYTHING to fix it. It happens when I sync my iPod. I've followed just about any relevant topics on the apple support site, but nothing helps. I've shut down any software, done the 5 r's, even reformatted my computer. I don't understand.

You should check your USBs to make sure there is nothing wrong with them.
Plug your iPod into the USB you would usually use for a regular charge.
(In Control Panel, due to versions of XP, you might not see the same interface as other users, in the top-left corner there should be a link that says "switch to classic view." This will give the same interface, regardless of what version of XP you are using.)
On Windows XP, go to Start>Control Panel>Performance and Maintenance>System>Hardware(tab)>Device Manager
Here you can check for updates, install/uninstall USB drivers, and preform diagnostics on your drivers.
Under your current computer, select the drop-down menu for Universal Serial Bus controllers. Depending on the Firmware of your Touch, under the USB controllers it will either show up as Apple Mobile Device USB Driver or Apple USB Mass Storage Device. Right click on Apple Mobile Device USB Driver and select "Update Driver" on the drop-down menu. This will give you the Hardware Update Wizard. Select Yes, this time only. Choose "Install the software automatically." (This option should alreasy be highlighted) Let the search finish. If updates are found, install them. If not click the back button on the bottom middle-left. Choose "Install from a list or specific location. Choose the "I will select the driver to install." In the install box, Apple Mobile Device USB and Digital Still Camera should pop up. Press next and let the wizard intstall updates. Click finish. Try to let your iPod charge for a while after this.

Boot camp displays "the installer disk could not be found"

I have burned the Windows 8.1 .iso image 3 times and for some reason when I try to start the bootcamp utility I get the message "The installer disc could not be found"... I have the Win 8.1 Pro disk in my superdrive and nothing happens! Very frustrating!

Reading other posts like this I have verified the installer disk.

Time Machine Error: "The backup volume could not be found"

Here's my problem: I click on "Back up now" and it "Prepares to backup" for a few seconds then fails.
I have been here: http://support.apple.com/kb/HT3275#4 and it didn't help at all as I'm using Time Machine, not Time Capsule. I only noticed the problem now, but it has been over a week since it was last backed up. (The computer was getting its logic board replaced)
Has anyone got a clue as to a fix to this situation? I really don't want to reformat my external HD as it has stuff that I'd love to keep on it - not to mention I don't want the hassle.
Thanks

Time Machine Failed Backup
After being without a backup for 3 months, I now have my backup program working again.My backup drive is a Western Digital 1TB drive connected by firewire. I'm not a tekkie but this worked painlessly for me and took only about 2 minutes from start to finish.
I had the same problem of being unable to launch a backup (although I could restore files. In retrospect the ownership privileges were pooched; although I could read, I couldn't write.) The 10.5.6 updated didn't provide the solution I had hoped to see and has even caused all kinds of similar problems for other people.
Cheers and good luck!
Rob
I found the thread here:
http://discussions.apple.com/thread.jspa?threadID=1827243&tstart=15
and this is the important part:
Using Terminal (found under utilities) type the following and be sure to include spaces where they occur.
$ cd /Volumes/Backup
$ ls -alF
$ sudo chown Username .001b63b6df97
"Backup" is the name of your TM drive
"Username" is, well, your username
.001b... is the name of the file TM states (also shown after the ls command)
For the ‘cd’ command, replace “Backup” with your volume name, e.g. My Time Machine (hint, you can type the first few characters and press TAB and the shell should auto-complete). For the ’sudo’ command, replace “jfoster” with your account name and use the file name shown in the error dialog (or the file listing given with ‘ls’).* The ’sudo’ command allows you to run the ‘chown’ (change owner) as root, but you will need to give your password to authenticate this action.
(*I also found the file name by clicking on the lowercase "i" in the red circle next to where it said Failed:)
credit for his goes to James Foster:
http://programminggems.wordpress.com/2008/12/16/mac-10-5-6/

The backup disk could not be mounted

I get this message when after trying to back up my Mac Book Pro to my Time Capsule. It was working great until a week ago. I have tried just about everything (resetting the TC, changing passwords, changing TC name, etc). Aside from checking it out the window is there any other suggestion?

Is there any way to go back to the factory settings including wiping the memory clean?
It's a two step process.
Step 1 is erasing the disk. Open AirPort Utility, click on Manual Setup, select the Disks icon at the top of pane and then click on the Disks tab just below and choose Erase.
Step 2 would be a hard reset as follows:
Pull the power plug from the TC
Hold in the reset button and continue to hold it in while you plug power back in
Release the reset button after approximately 10 seconds

The installer disk could not bee found.

i want to install windows Xp in a partition of 35 G. i did befor a other times please help me please.

Hi, I think you'd be far better off not Partitioning, & using one of these, the last one is Free!
Parallels...
http://www.parallels.com/
VmWare Fusion...
http://www.vmware.com/mac
VirtualBox...
http://www.virtualbox.org/wiki/Downloads

The backup disk could not be found.

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