You can automate your snapshot operations on SkyAtlas Panel.
SkyAtlas Panel provides you Auto Snapshot utility.
For creating new instance, except on the Source tab, you should select option YES on the Create New Volume area and fill the Volume Size(GB) area.
For creating auto snapshot you can follow the steps:
Compute -> Auto Snapshot -> Create Auto Snapshot
After that, you must specify instance name for creating auto snapshot. You can select Snapshot Period per Hourly, Daily, Weekly, Monthly. Also you can specify the Total Snapshot Count area. After filling areas, please click Create Auto Snapshot button.