There are a couple of ways by which you can clear some space here from "/opt/Data3SixtyAnalyze/data-7731/executions"
1. In Data3Sixty Analyze select a data flow from the directory and then on the right-hand menu "Delete Run Data"
You have to do that on a per-data flow basis.
2. Are you scheduling data flows? If yes, you have to set up this screen. It will help fill up the disk rather quickly
If you change those settings (particularly from not deleting everything to something reasonable) it will take some time (won't happen immediately expect an hour or two) but the system will automatically purge down to the limits you set.
You can select the number as per your wish.
3. You can also delete files directly from /data-7731/executions/<username>
Note: Please DO NOT DELETE item in the folder named "cache"!
You can also import the attached data flow and feel free to modify it per your own use (schedule it at least weekly or daily).