I backed up with an external drive, but it only backed up part, do I erase the complete back up and start again?

My system is OS 10.8.5 Memory  4 GB 1333 MHz DDR3, storage available 375 GB out of 500 GB. Yesterday I tried to back up with the Seagate Backup Plus Drive with 1.5 TB using the Time Machine. The backup started, said it would take 3 hours, but ended at 2 hours when the computer went to sleep when I had to leave the desk.When reviewing "About this Mac",it appears under Macintosh HD the amount of GB for Audio 20.53GB, Movie18.66 GB, Photo 4.56 GB, Apps 11.92 GB, Backups zero KB, Other 64.54 GB on the same menu below, appears the External Seagate Back up plus but with Zero KB on Audio, Movies, Photos, Apps, Backups 74.48 GB, zero KB in Other zero KB.I believe that for some reason the back up was not finished complete and only copied 74.48 GB. My question is how do I erase this and start over so I can have a complete first back up with everything. If I did something wrong, I do not get where it was. Thank you so much.
I
o
  Capacity: 499

You let the computer go to sleep. When it did then so did the backup drive. The first bit of advice is do not use the software provided with the Seagate backup drive. The second bit of advice is to completely re-partition and format the drive.
Drive Partition and Format
1. Open Disk Utility in your Utilities folder.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Apply button and wait until the process has completed.
4. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
5. Set the format type to Mac OS Extended (Journaled.) Click on the Security button, check the button for Zero Data and click on OK to return to the Erase window.
6. Click on the Erase button. The format process can take up to several hours depending upon the drive size.
Clone Mavericks, Lion/Mountain Lion using Restore Option of Disk Utility
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
     1. Select Disk Utility from the main menu then press the Continue
         button.
     2. Select the destination volume from the left side list.
     3. Click on the Restore tab in the DU main window.
     4. Select the destination volume from the left side list and drag it
         to the Destination entry field.
     5. Select the source volume from the left side list and drag it to
         the Source entry field.
     6. Double-check you got it right, then click on the Restore button.
Destination means the external backup drive. Source means the internal startup drive.
Finally, get a good backup utility to incrementally update the clone.
Suggested Backup Software
  1. Carbon Copy Cloner
  2. Get Backup
  3. Deja Vu
  4. SuperDuper!
  5. Synk Pro
  6. Tri-Backup
Others may be found at MacUpdate.
Visit The XLab FAQs and read the FAQ on backup and restore.  Also read How to Back Up and Restore Your Files.

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