NXPixels saves versions of every design for you: before each editing session and every 10 minutes while you work.
- Open the design and click File → Version history.
- Click a thumbnail to see it larger.
- Click Restore to go back to it.
Restoring first keeps what you have now as a version, so nothing is lost, and Ctrl+Z undoes a restore.
Before a big change, click Keep this version so you have a named point to come back to.
The free plan keeps the last 10 versions of each design, Teams keeps 100.