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I have an external 2TB drive that I've been using for Time Machine Backups directly connected to my Mac. I've recently gotten a Time Capsule and would to continue backing up with the existing backup, so that I keep the history I already have and do not need to start from scratch.

I'm able to see the drive and can see the Backups.backupdb directory, as well as the subdirectory that contains my backup, but if I try to backup, it starts from scratch on the drive in a toplevel directory (/Volumes/T2/mbp instead of /Volumes/T2/Backups.backupdb/mbp). This also does not look like the same type of content of the backups made from the direct connect drive.

Is there some way to use the existing backup and continue from where I was?

Is this a safe and reliable method for using Time Machine?

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up vote 1 down vote accepted

You are correct. Time machine makes a sparse disk bundle to hold backups on Time Capsule and instead uses a folder for attached hard drives.

Due to the security settings on the backup files, it's not as easy or reliable, but here's how you could start:

  1. Get a first backup or two on the TC to set up the sparse bundle
  2. Disable Time Machine
  3. Mount the Bundle and disable the security that keeps you from writing to it
  4. Delete the current backups since they likely won't mesh correctly with the old ones. (I'm not 100% sure this is needed - but I would do it)
  5. Copy in the old history
  6. Re-enable the security and ensure file permissions on the Time Capsule files are correct.
  7. Enable Time Machine and start a backup to see how it goes.

See this macworld article for a version of the commands to disable and then re-enable the protection on the sparse bundle disk image. I haven't done this as I would rather not muck with the internals of Time Machine. I know I only have to connect the old hard drive to my mac to see all my old history. The risk of using old incorrect information isn't worth it to me - but that doesn't mean you don't have a good reason to move the files over. If I were to do this, I'd consult with a Apple technician as they gave me specific instructions on 10.5 when I had a MLB swap on how to migrate the old Time Capsule backups to work with the "new" mac. Do have a look at the end of the Time Machine lesson in Mac 101 There's a nice tip on option click of the Time Machine menu bar icon to view files on older volumes than the current one.

Good Luck

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