Archive based on mask size question

I'm going to be working with a client who has a production repository in MDME 4.0. It has a size of about 4.5GB. In order to prep for the interaction with the client next week, I've asked for an archive based on a mask. They've created a mask which contains about 10 records. The file size has been reduced to about 1GB.

What can I do to trim the file size down even further besides reducing the number of records?

Erika

Any other options can you think of for me to access the data?