SQL Purge of Post Revisions before and after?

I noticed the crazy amount of post revisions for every post i had so i did some searching and purge unused revisions from my database.

The questions is does this sound right about the SQL size now?

Before:
MySQL Disk Space 76.68 MB
Actual Backup file size 45MB

After:
MySQL Disk Space 76.68 MB
Actual Backup file size 9.84MB

That is a huge drop in size I am showing no errors anywhere the purge was successful over 600 post checked older ones still valid data.

The purge code was
DELETE FROM wp_posts WHERE post_type = "revision";