Capacity Planning – Yes Transaction Log Space is Critical to Keeping your Databases Healthy and Mounted

We got caught by the massive logs generated in moving a Mailbox DB.  Now, when we execute a full backup on a passive DB (Commvault), the logs don't get truncated..  All our capacity planning sort of thrown out the window if our logs just grow eternally.  Do ALL DB's need to be backed up before logs are truncated???  You are definitely right though.. logs make the world go 'round and without enough space, it's unhappy user time.