Here is the final log from Time Machine...it failed. The HD is a few years old, but it worked a few months ago. In any case, based from your previous reply, I might just have to buy a new external HD.
Starting automatic backup
Backing up to: /Volumes/Mig's Backup/Backups.backupdb
Forcing deep traversal on source: "Macintosh HD" (mount: '/' fsUUID: 26F50EE0-D3F0-3E24-9686-4E0AF6EADF57 eventDBUUID: 7363E412-F2EB-4E09-BD1B-6413DFA1762F)
Found 1230727 files (296.51 GB) needing backup
356.26 GB required (including padding), 475.02 GB available
Unexpected result from MDBackupIndexFile (1) for: /Library/WebServer/share/httpd/manual/mod/mod_rewrite.html.en, /Volumes/Mig's Backup/Backups.backupdb/Miguel Lopez’s MacBook Pro 17"/2012-11-28-174913.inProgress/15F34B31-7D23-465E-89DD-29000848B034/Macintosh HD/Library/WebServer/share/httpd/manual/mod/mod_rewrite.html.en
Stopping backup.
Error: (-47) SrcErr:NO Copying /Users/Mig190/Library/Mail/V2/IMAP-mig190@imap.gmail.com/[Gmail].mbox/All Mail.mbox/AA2D8EA0-484E-4CF1-B7AC-C8C3516B64BB/Data/3/3/Attachments/33428/2/pla yoff schedule 2007.xls to /Volumes/Mig's Backup/Backups.backupdb/Miguel Lopez’s MacBook Pro 17"/2012-11-28-174913.inProgress/15F34B31-7D23-465E-89DD-29000848B034/Macintosh HD/Users/Mig190/Library/Mail/V2/IMAP-mig190@imap.gmail.com/[Gmail].mbox/All Mail.mbox/AA2D8EA0-484E-4CF1-B7AC-C8C3516B64BB/Data/3/3/Attachments/33428/2
Copied 500597 files (40.24 GB) from volume Macintosh HD.
Copy stage failed with error:11
Error: (22) setxattr for key:com.apple.backupd.HostUUID path:/Volumes/Mig's Backup/Backups.backupdb/Miguel Lopez’s MacBook Pro 17" size:37
Backup failed with error: 11
Starting automatic backup
Backing up to: /Volumes/Mig's Backup/Backups.backupdb
Error: (22) setxattr for key:com.apple.backupd.HostUUID path:/Volumes/Mig's Backup/Backups.backupdb/Miguel Lopez’s MacBook Pro 17" size:37
Backup failed with error: 2
And yes, I did see the Disk Utility image.