Time Machine + Time Capsule problems

Question

Hi,
I'm having this issue for a coiuple of years now. Recently updated from Snow Leopard to Mountain Lion and thought to give it another try. Same outcome.
Back then I even brought it to the Genius guys and the time machine worked fine.
I created everything from scratch. Set up File sharing in Airport Utility with new name, etc.
When I select the new backup disk (my Time Capsule with different name - no facny characters, etc.), Time Machine spends some time first "preparing backup", then I see a volume created (disk image), called Time Machine Backups, and then Time Machine displays: Looking for disk (or similar).
That goes on for a while and then I get the error message:
"Time Machine couldn’t complete the backup to “Time Capsule”
The backup disk image “/Volumes/TomsTimeCapsule/Intel Mac mini.sparsebundle” could not be accessed (error -1)."
And the Time Machine Backups disk image is still sitting on my desktop, doesn't unmount.
In the meantime I do see a sparsebundle file has been created and it is with every try exactly 872.5MB large.
here is the log:
Starting manual backup
Attempting to mount network destination URL: afp://[email protected]/TomsTimeCapsule
Mounted network destination at mount point: /Volumes/TomsTimeCapsule using URL: afp://[email protected]/TomsTimeCapsule
Creating disk image /Volumes/TomsTimeCapsule/Intel Mac mini.sparsebundle
Failed to hide extension on /Volumes/TomsTimeCapsule/Intel Mac mini.sparsebundle, error: Error Domain=NSCocoaErrorDomain Code=4 "The file “Intel Mac mini.sparsebundle” doesn’t exist." UserInfo=0x7ff0cd04b8e0 {NSURL=file://localhost/Volumes/TomsTimeCapsule/Intel%20Mac%20mini.sparsebundle /, NSFilePath=/Volumes/TomsTimeCapsule/Intel Mac mini.sparsebundle, NSUnderlyingError=0x7ff0cd03fa00 "The operation couldn’t be completed. No such file or directory"}.
Failed to eject volume /Volumes/TomsTimeCapsule (FSVolumeRefNum: -122; status: -47; dissenting pid: 0)
Waiting 60 seconds and trying again.
Network destination already mounted at: /Volumes/TomsTimeCapsule
Failed to eject volume /Volumes/TomsTimeCapsule (FSVolumeRefNum: -122; status: -47; dissenting pid: 0)
Waiting 60 seconds and trying again.
Network destination already mounted at: /Volumes/TomsTimeCapsule
Failed to eject volume /Volumes/TomsTimeCapsule (FSVolumeRefNum: -122; status: -47; dissenting pid: 0)
Giving up after 3 retries.
Backup failed with error: 21
[SnapshotUtilities mountPointForVolumeRef] FSGetVolumeInfo returned: -35
Failed to eject volume (null) (FSVolumeRefNum: 0; status: -35; dissenting pid: -1)
Failed to eject Time Machine disk image: /Volumes/TomsTimeCapsule/Intel Mac mini.sparsebundle
Thank you!

Answer 1

I have a Comcast cable modem: Arris Model#: TM702G/CT.
TC functions as a router
Mini uses Ethernet, but I tried with wireless as well.
Will try the isolated setup next.
in the meantime I found somewhere somebody erased all contents of his Library/System Configuration folder as well as the Library/Cache folder. Also deleted the com.apple.TimeMachine.plist file.
Then rebooted and tried again - this time I got the following error log:
(IntelMacMini is my file sharing name)
Macintosh is the hard drive name
Starting manual backup
Attempting to mount network destination URL: afp://Thomas%[email protected]/TimeCapsuleBackup
Mounted network destination at mount point: /Volumes/TimeCapsuleBackup using URL: afp://Thomas%[email protected]/TimeCapsuleBackup
Renaming /Volumes/TimeCapsuleBackup/Macintosh.sparsebundle to /Volumes/TimeCapsuleBackup/IntelMacMini.sparsebundle
detach: could not open /dev/disk2
Failed to eject volume /Volumes/TimeCapsuleBackup (FSVolumeRefNum: -106; status: -47; dissenting pid: 0)
Waiting 60 seconds and trying again.
Network destination already mounted at: /Volumes/TimeCapsuleBackup
Failed to eject volume /Volumes/TimeCapsuleBackup (FSVolumeRefNum: -106; status: -47; dissenting pid: 0)
Waiting 60 seconds and trying again.
Network destination already mounted at: /Volumes/TimeCapsuleBackup
Failed to eject volume /Volumes/TimeCapsuleBackup (FSVolumeRefNum: -106; status: -47; dissenting pid: 0)
Giving up after 3 retries.
Backup failed with error: 21
[SnapshotUtilities mountPointForVolumeRef] FSGetVolumeInfo returned: -35
Failed to eject volume (null) (FSVolumeRefNum: 0; status: -35; dissenting pid: -1)
Failed to eject Time Machine disk image: /Volumes/TimeCapsuleBackup/IntelMacMini.sparsebundle