Making backups of system data is prudent. It can give you the freedom to test some ideas out, new systems, different data formats or columns to include. In general, making a backup at regular intervals, and whenever there's a major change at your end, is a good plan!
We've now updated the backups so you can simply login, view your My Data, click on backups, and voila! You'll get the downloaded tables, 1 sheet per table, in a single zip file for ease of download and storage.
How to Backup Your Data
Step 1: Login to Target Dashboard and Click on My Data