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I am on Sierra (10.12.2) and my 2TB time capsule just died. I took out the drive and to my surprise was able to mount it via USB through a SATA docking station. I was thinking I could just continue (at least temporarily) to use it as my Time Machine drive, but I am having an impossible time getting Time Machine to recognise the drive. I always get an error saying "Can't connect to a current Time Machine backup disk"

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I can see the backups and can select the disk to be my time machine disk, but Time Machine does not recognise the backups.

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However, I can open the sparsebundle with diskimagemounter and browse the backups, so everything seems to be in order.

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But I cannot figure out how to get Time Machine to recognise this drive and continue backing up where I left off. Any ideas?

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    Best idea, if the drive is failing/erroring is not to trust it for your backup drive – Tetsujin Jan 14 '17 at 19:14
  • 100% agree. The idea is to recover these old backups and then move them to a new drive. At the moment I don't see how to migrate these backups to a new drive if Time Machine won't recognise them. – emh Jan 14 '17 at 19:26
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As noted in some comments, I would not rely completely on that disk since it was part of a failed system.

However, since it seems like the time machine files are stored inside a disk image, it should be possible to use Disk Utility to restore that image to a new empty harddisk, as long as it is at least the same size (like 2 TB in your case). When that is done, I would expect the new disk to be recognizable for Time Machine as as a backup disk, and continue your backups from there.

First, connect a new, blank hard disk. Open Disk Utility and make sure the new disk appears in the Disk Utility Window. Now drag the icon of the disk image from your old backup drive that contains the Time Machine partition (named 'mac' in your first screenshot) into the left sidebar of the Disk Utility Window. Then you are able to restore that disk image onto the new blank disk. The new disk will now contain the complete filesystem of the disk image and should be recognizable for Time Machine.

Be aware though, if the file system is corrupted on your old disk, it would mean that continuing backing up on top of that file system would continue to be corrupted, and therefore you are at risk of having an unusable or incomplete backup, even after several incremental backups.

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