The backup disk image “/Volumes/Data/Macintosh.sparsebundle” could not be accessed (error -1)

Test then in complete network isolation.

TC factory reset.. plug into the iMac.. and no other connection.. and see if the backup works.. if it fails there is a network problem.. Or the TC is no good.

I strongly recommend you reset the TM see A4 pondini.

http://pondini.org/TM/Troubleshooting.html

And manually mount the TC hard disk on the computer..

using finder.. go , connect to server.

AFP://TCname or TCIPaddress

Did it work before you upgraded to Mavericks.. because I think many people are having problems.

Don't forget the TC if Gen1-4 needs to be on 7.6.4 firmware.. and needs IPv6 working in local link on the ethernet port.

Ok, I will do. But at the moment the backup via USB is running.

Should I disconnect TC before (Is autodetected always)?

I start my excurse with Lion on my iMAC with the same probs. So I thought might be a prob with Lion.

Did fresh install with Mavericks USB.

The IPv6 Topic is new for me (Its a Gen5 TC) . Do you have a link or description where I can read more about that ( In relationship with TC)?

Need ipv6 in 6.3 utility

http://support.apple.com/kb/TS4597

Did everything as told. No succes. I installed the buddy widget. Intersting Log. It seems that TM creates the sparsebundle but in the next step TM is not able to access the sparsebundle.

Log:

Attempting to mount network destination URL: afp://my%20name@TC._afpovertcp._tcp.local/Data

Mounted network destination at mount point: /Volumes/Data-1 using URL: afp://my%20name@TC._afpovertcp._tcp.local/Data

Creating disk image /Volumes/Data-1/my name Computer.sparsebundle

Failed to hide extension on /Volumes/Data-1/my name Computer.sparsebundle, error: Error Domain=NSCocoaErrorDomain Code=4 "The file “my name Computer.sparsebundle” doesn’t exist." UserInfo=0x7fa519d2ae30 {NSURL=file:///Volumes/Data-1/my%20name%20Computer.sparsebundle/, NSFilePath=/Volumes/Data-1/my name Computer.sparsebundle, NSUnderlyingError=0x7fa519d2b510 "The operation couldn’t be completed. No such file or directory"}.

Failed to eject volume /Volumes/Data-1 (FSVolumeRefNum: -144; status: -47; dissenting pid: 0)

Waiting 60 seconds and trying again.

Network destination already mounted at: /Volumes/Data-1

Failed to eject volume /Volumes/Data-1 (FSVolumeRefNum: -144; status: -47; dissenting pid: 0)

Waiting 60 seconds and trying again.

Backup canceled.

Failed to eject volume /Volumes/Data-1 (FSVolumeRefNum: -144; status: -47; dissenting pid: 0)