Time machine creating new backup for external hd every time it is connected.

Hi.
I have recently gotten a Time Capsule to back up my files.
I want to back up my internal harddrive as well as an external harddrive with master images from aperture.
Theoretically time machine should skip trying to back up the external drive when it is not connected, and make a backup when it is. (I only connect the disk when working with the images)
However, the problem is that every time I connect the external hd to back it up, time machine seems to create a total new backup of the whole drive and not just the changes. It seems to not recognise that it has already backed up the disk before. Does anyone know how to fix this?
I know it is possible, since I have used this system before, but can't quite figure out how to solve the problem.
Thanks!

However, the problem is that every time I connect the external hd to back it up, time machine seems to create a total new backup of the whole drive and not just the changes. It seems to not recognise that it has already backed up the disk before. Does anyone know how to fix this?
If the drive is not recognised.. you should see multiple external drives in the backup.. is that in fact what is happening.
What makes you think it is doing a whole new backup??
One factor you may not have considered is that Time Machine does need to do a deep scan of the disk when it has missed more than a few days. A deep scan can take ages over wireless as it will have to actually compare the backup with the files on the disk. Determine what has changed, make up a list of files that need backup and then start and actually do the backup.. this might even take longer than a straight clean backup.
Have you checked the TM log for what it is really doing?? Pondini widget will give you that info. See A1 here.
http://pondini.org/TM/Troubleshooting.html
I have a simple solution.. that will cost you around $40.. use Carbon Copy Cloner.. not Time Machine. It simply handles this kind of thing better.
There are a number of other solutions that you can buy.. 3rd party backup software.. you can even do it manually via rsync.. however.. a tool like CCC which is based on rsync is a heck of lot easier than writing your own backup scripts.

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I keep getting this error on my new Macbook Pro w/ Retina.
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I have a little network with 2 x Macpro, 1 x Macbook pro Retina, 1 x Mac Mini server and one DiskStation.
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Scott F wrote:
Time Machine completed a verification of your backups. To improve reliability, Time Machine must create a new backup for you.
Yes. See #C13 in [Time Machine - Troubleshooting|http://web.me.com/pondini/Time_Machine/Troubleshooting.html] (or use the link in *User Tips* at the top of this forum).
My Time Machine drive is a 500GB drive connected to an Airport Extreme via USB.
I hate to have to tell you this, but backing-up that way is "iffy" and +*not supported by Apple.+* See [Using Time Machine with an Airport Extreme Air Disk|http://web.me.com/pondini/Time_Machine/Airport.html] (or use the link in *User Tips* at the top of this forum).
You really should find a more reliable way to back up. See #2 in [Time Machine - Frequently Asked Questions|http://web.me.com/pondini/Time_Machine/FAQ.html] (or use the link in *User Tips* at the top of this forum) for your options.
I find this message confusing. Why must TM create a new backup?
As in the first link above, because they're damaged beyond Disk Utility's ability to repair them. Exactly what that is, we mere mortals don't know. It's only on network backups, and even folks using Time Capsules see this occasionally.

Why do I get this message every time I travel with my laptop and then return home: To improve reliability, Time Machine must create a new backup for you.

Why do I get this message every time I travel with my laptop and then return home: "To improve reliability, Time Machine must create a new backup for you."
I get this on my new MacBook Air, but never got it on my old MacBook Pro.
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See #C13 in Time Machine - Troubleshooting.

I got the message: Time Machine completed a verification of your backups. To improve reliability, Time Machine must create a new backup for you. I got the message: Time Machine completed a verification of your backups. To improve reliability, Time Ma

I got the message:
Time Machine completed a verification of your backups. To improve reliability, Time Machine must create a new backup for you.
Here's what the text of the system.log says when I filter for backupd:
Jan 9 11:37:14 justin-steeds-macbook-pro com.apple.backupd[2618]: Starting standard backup
Jan 9 11:37:14 justin-steeds-macbook-pro com.apple.backupd[2618]: Network destination already mounted at: /Volumes/TimeMachine
Jan 9 11:37:33 justin-steeds-macbook-pro com.apple.backupd[2618]: Recovery backup declined by user.
Jan 9 11:37:33 justin-steeds-macbook-pro com.apple.backupd[2618]: Backup canceled.
Jan 9 11:48:20 justin-steeds-macbook-pro com.apple.backupd[2859]: Starting standard backup
Jan 9 11:48:20 justin-steeds-macbook-pro com.apple.backupd[2859]: Network destination already mounted at: /Volumes/TimeMachine
Jan 9 11:48:42 justin-steeds-macbook-pro com.apple.backupd[2859]: Recovery backup declined by user.
Jan 9 11:48:43 justin-steeds-macbook-pro com.apple.backupd[2859]: Backup canceled.
Jan 9 11:51:07 justin-steeds-macbook-pro com.apple.backupd[2917]: Starting standard backup
Jan 9 11:51:07 justin-steeds-macbook-pro com.apple.backupd[2917]: Network destination already mounted at: /Volumes/TimeMachine
Jan 9 11:51:34 justin-steeds-macbook-pro com.apple.backupd[2917]: Recovery backup declined by user.
Jan 9 11:51:34 justin-steeds-macbook-pro com.apple.backupd[2917]: Backup canceled.
Jan 9 11:53:50 justin-steeds-macbook-pro com.apple.backupd[2987]: Starting standard backup
Jan 9 11:53:50 justin-steeds-macbook-pro com.apple.backupd[2987]: Network destination already mounted at: /Volumes/TimeMachine
Jan 9 11:54:07 justin-steeds-macbook-pro com.apple.backupd[2987]: Recovery backup declined by user.
Jan 9 11:54:07 justin-steeds-macbook-pro com.apple.backupd[2987]: Backup canceled

Since this is a MacBook Pro hardware community, you might get better results by asking your question at the Time Machine forum, located within the Lion discussion group.
https://discussions.apple.com/community/mac_os/mac_os_x_v10.7_lion

Time Machine completed a verification... must create new backup??

I just saw a notice on my headless MacMini that "Time Machine completed a verification of your backups. To improve reliability, Time Machine must create a new backup for you. Click Start New Backup to create a new backup. This will remove your existing backup history. Click "Backup Later" to be reminded tomorrow.
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Bob,
After re-reading my initial reply, please do NOT think I was saying that "you" didn't answer my question about what happened.
I was trying to imply that sunspots and cosmic rays are indeed sometimes part of our life in IT, and that I was just going to "accept it, lose my history, and go on".
I do truly appreciate help, and would have hated to have you think that was directed "at" your reply...
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Time machine starts new backup...

here is the situation...
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Time machine creating new backup for external hd every time it is connected.

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