I have compiled the script and the update script asks for user input for updating the custom 8 field and the reviewed items field (I thought this would be more universally beneficial), it then copies the accession number to the label field (so you can actually use it to search for duplicates) and the record number to the call number field.
The backup script backs up the open library with the date and time preceeding the library name (yyyymmdd_hhmm_<libraryname>). So my library is name aecclib, when I back it up with this script at 11:01 on 10/09/2014, the file name of the backup is 20141009_1101_aecclib.enlx.
The compiled versions of tthe backup script and the update script are too large to be attached (382k each). So I put the scripts in a zip file in my dropbox:
https://www.dropbox.com/sh/0ct5ey7xplylt99/AAAz-sUkrbnd0yywTZn7_KaTa?dl=0
Update: I have found that the backup script is the most useful of the two and t=I use a script that automates the Find Reference Updates function on a daily basis. The script, if it is running, will be automatically invoked when you right click on references and choose find reference updates. Be sure to backup your database before using this. It updates all fields, even though my library is highly customized, I have yet to have a problem. I am linking to the compiled version of the script, just extract from the zip file.
https://www.dropbox.com/s/iz6lp9khg6t1h3q/findrefupdates.zip?dl=0
backup.zip (381 KB)
update.zip (381 KB)