1. Stuart Goldberg's Avatar
    Ive used Time Machine for a couple years with no problem. Recently it stopped deleting the olds backup. Heres what Ive been doing: erase external backup disk with disk utility (the only way I know, cant drag files to trash) Volume Format Mac OS Extended (journaled), turn off TM, delete com.apple.TimeMachine.plist, go to TM prefs and click Change Disk and choose my external HD. The first backup works fine. After that I have problems. I get a message Machine Error, Backup volume could not be found. When I go to preferences and click on the red i by failed, it says, Unable to complete backup. Error occurred while creating Backup directory. Any thoughts? Thanks in advance.

    Below are logs generated from Time Machine Buddy.

    Starting standard backup
    Cookie file is not readable or does not exist at path: /Volumes/Time Machine/.002241202b5c
    Volume at path /Volumes/Time Machine does not appear to be the correct backup volume for this computer. (Cookies do not match)
    Backup failed with error: 18

    Starting standard backup
    Backing up to: /Volumes/Time Machine/Backups.backupdb
    Event store UUIDs don't match for volume: Macintosh HD
    No pre-backup thinning needed: 24.66 GB requested (including padding), 108.87 GB available
    Waiting for index to be ready (910 > 0)
    Error writing to backup log. NSFileHandleOperationException:*** -[NSConcreteFileHandle writeData:]: Input/output error
    Error: (-36) SrcErr:NO Copying /Users to /Volumes/Time Machine/Backups.backupdb/Stuart Goldbergs iMac/2011-11-21-060353.inProgress/8047D603-A193-422B-B765-58016121FF3A/Macintosh HD
    Error writing to backup log. NSFileHandleOperationException:*** -[NSConcreteFileHandle writeData:]: Input/output error
    Error: (-36) SrcErr:NO Copying /usr to /Volumes/Time Machine/Backups.backupdb/Stuart Goldbergs iMac/2011-11-21-060353.inProgress/8047D603-A193-422B-B765-58016121FF3A/Macintosh HD
    Error writing to backup log. NSFileHandleOperationException:*** -[NSConcreteFileHandle writeData:]: Input/output error
    Error: (-36) SrcErr:NO Copying /Utilities alias to /Volumes/Time Machine/Backups.backupdb/Stuart Goldbergs iMac/2011-11-21-060353.inProgress/8047D603-A193-422B-B765-58016121FF3A/Macintosh HD
    Error writing to backup log. NSFileHandleOperationException:*** -[NSConcreteFileHandle writeData:]: Input/output error
    Error: (-8088) SrcErr:NO Copying /var to /Volumes/Time Machine/Backups.backupdb/Stuart Goldbergs iMac/2011-11-21-060353.inProgress/8047D603-A193-422B-B765-58016121FF3A/Macintosh HD
    Error writing to backup log. NSFileHandleOperationException:*** -[NSConcreteFileHandle writeData:]: Input/output error
    Error: (-36) SrcErr:NO Copying /Volumes to /Volumes/Time Machine/Backups.backupdb/Stuart Goldbergs iMac/2011-11-21-060353.inProgress/8047D603-A193-422B-B765-58016121FF3A/Macintosh HD
    Formulating crash report for process backupd[1453]
    11-21-2011 08:13 AM
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