I've been trying to backup my ipod for two days and now get this message - An error occurred while backing up this iPod (0xE8000084). Would you like to continue to update this iPod?

Question

I've been trying for the last two days to backup my ipod touch before I sync.  Now I get this message.

Answer 1

It's likely that your backup is corrupt. Try deleting the backup, then right click on the name of the phone in iTunes and choose "back up". To delete go to iTunes Preferences, Devices tab. Highlight and delete the most recent backup. Note that sometimes deleting this way leaves some garbage around that can still interfere with a new backup, so you should verify that the backup folder is empty.
from: http://support.apple.com/kb/HT4946
The folder where your backup data are stored varies depending on the computer's operating system.   Make sure the backup folder is included in your periodic data-backup routine.
iTunes places the backup files in the following places:
Mac:  ~/Library/Application Support/MobileSync/Backup/
Windows XP:  \Documents and Settings\(username)\Application Data\Apple Computer\MobileSync\Backup\
Note: To quickly access the Application Data folder, click Start, and choose Run. Type %appdata% and click OK.
Windows Vista and Windows 7:  \Users\(username)\AppData\Roaming\Apple Computer\MobileSync\Backup\
Note: To quickly access the AppData folder, click Start. In the search bar, type %appdata% and press the Return key.