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Entourage stores all of your data (Rules, mailing lists, signatures, messages, address book, schedules, contacts, tasks, notes, calendar events) in a database. Your database is located in your Identity named Main by default.
~/Documents/Microsoft User Data/Office 2008 Identities/Main Identity

Comments (7)
Entourage 2004 Data Base 1.59 GB.
Thanks for sharing. I hope you voted in the poll so your number will be part of the averages.
Such huge file sizes as Entourage creates makes network backup a real pain. How I wish they'd break it up into separate files (such as one for each mailbox, one for contacts, etc.)
--F.
There are way to archive or move your messages out of your current Identity to keep it smaller and still have access. Check out:
Archive Your Data
Backup Individual Items
Archiving your e-mails with EagleFiler
FWIW, contacts, events, notes, tasks are very small files. It's your messages especially attachments that are large.
I also encourage you to Send MSFT feedback
My database is 907.6 MB, so even though I checked "under 1GB" I will soon be in the 1-4GB range.
My database is 14.8BG. what should I do in order to back up in an external hard disk? My external hard disk has 390GB empty space. Thanks
You can simply copy over your Main Identity to the external. I suggest putting it in a folder with the date in the name. Other wise you would have to check the Date Modified on the database file.
You can export your data as an .rge file or just messages as .mbox files. We cover all these options in our backup Entourage series. Backup Entourage Series
If you are asking how to reduce the size of your database and archive those messages, this is a bit more complex. See this page to get you started.
Archive Your Data
Tip: If you export all items as Entourage archive (.rge) file then compare the size of the .rge file to the size of your database file, you can see how much 'wasted space' is in your database.