SEP 12.1.2 Content Database is almost 40Gb

I'm a little concerned that in 2 months the Content database has grown to almost 40GB, is this considered normal?

We have 7 clients as present as it's still being tested - but we keep 30 days worth of definitions - is it somehow storing the definition data despite already having a inetpub>content folder of 110GB (we've provisioned sufficient storage for the defititions at that location)?

SEPMs are 12.1.2

SQL is 2012