Would appreciate any help you can offer. My setup: Late 2012 Mac Mini OS X 10.8.3 Synology DS212j Running DSM 4.2 -3202 Connected to Airport Extreme with Synology supplied Cable. I have followed the tutorial for setting up Time Machine Backup to the letter several times. I can set the disk station as the back up device and everything seems fine until it tries to back up, then I get the error message "Time Machine couldn't complete the backup to "DiskStation". The backup disk is not available. I have checked and rechecked every detail outlined on the tutorial locatedhttp://www.synology.com/support/tutorials_show.php?q_id=481 and still get the same issue. When I set the disk and Time Machine begins it's backup countdown I can click on Back Up Now and it will start the backup and work successfully one time then not backup again without the same error. If I let it count down to 0 and try and backup it fails with the same "Disk Not Available" error. The only way to gat it to backup is to set everything from scratch and then immediately click back up now" before it counts down. and then it will only work once. If I go to Synology settings and uncheck "Enable Mac File Service" click apply then recheck it and click apply again, then go and select the disk again in time Machine it will work one time again if I click "Backup Now" I am at a loss, I have done a lot of searching but can't seem to find any answers.