By using the Insight Editor you can create insights from scratch using SQL. To avoid losing any information, you can turn on the Insight editor's auto-save mode.
Turn on the auto-save mode
This setting is only available to administrators and can be accessed via the Settings (gear) icon in the upper right corner of Gtmhub - Configuration - Editor.
Once turned on, the insight editor will auto-save every 20 seconds, making sure you will not lose any valuable data.