TS1550 Time machine failed... has backed up before.  Have 235 GB uses on LaCie 1 TB drive - format is Mac OS Extended (journaled).  Any  ideas or help appreciated.  Worked OK until today,

Back-up has worked fine until today. Cannot completelately -"Back-up failed.  Stopped all programs and tried again - no go.Have LaCie 1TD drive, 235GB used.
Format OS extended (journaled) on the drive.
Mac OSX 10.8.8.
iMac 2.4 GHz Core 2 Duo
Any ideas appreciated.
Have same drive on newer iMac - appears OK.

Hi Joseph, was hoping the resident TM expert Pondini would drop in, but I guess not.
"Try Disk Utility
1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu at top of the screen. (In Mac OS X 10.4 or later, you must select your language first.)
*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
3. Click the First Aid tab.
4. Select your Mac OS X volume.
5. Click Repair Disk, (not Repair Permissions). Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
Then try a Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.
(Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive.)
Repair the external/backup drive also.

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