You can edit the backup plan and enable encryption on an existing backup. Just keep in mind that enabling, disabling, or changing the encryption setting / passkey will automatically trigger all files to be backed up the next run.

Great! Thank you for the reply!

Can you talk about version 7 and what features will be modified, changed etc?

I wish I could. The only thing that we've announced publicly is GFS - which will make long retention more configurable. We'll make a full announcement to our customers as we get closer to the release. I appreciate your patience.