If you want to archive past campaigns that are no longer active, you can easily archive through your Campaign Settings.
Here's how you can archive your campaigns:
Step 1: Under Campaigns, select the Settings icon of the campaign you wish to archive.
Step 2: Under Global, select Administration.
Step 3: Select Archive Campaign, and Confirm.
Note: Archiving campaigns, will automatically take them offline.
Your archived campaign will now be removed from the All Campaigns group in the Campaign list. You can find your Archived campaigns under the Archived Campaigns group.