You can store base groups you no longer use in the cloud in order to free storage of your account.
There are two possible ways: first one is to store the base group from the base group you want to store and the other one is to store the base group from the base groups list.
Store from the base group:
Access the base group > 3 vertical dots > Actions > Store in the cloud.
When you select Store in the cloud a new message will pop up to confirm if you're sure to store the base group in the cloud.
Store from the base groups list:
Main menu > Base groups > 3 vertical dots > Actions > Store base groups in the cloud.
All the base groups will be listed divided into those stored in the cloud and those not stored. If you click on the base groups not stored you can store them.
Unstore base groups
To unstore a base group you only need to click on the group you want to unstore. Right after, confirm you want to unstore the group and the group will be unstored. Then you can work with the group as usual.