GitHub user daviftorres added a comment to the discussion: What does Snapshots, 
Backups, and Incremental Snapshots mean in CloudStack

> **Note:** I had to include memory because the instance snapshots could (in 
> that occasion) only be taken when the instance is in the Running state. 
> Please correct me if I am wrong. This instance was deployed from an ISO.

Answering my own question, the fact that limited the Instance Snapshot without 
adding the memory was the missing setting `rootDiskController` = `osdefault`:

<img width="1009" height="418" alt="image" 
src="https://github.com/user-attachments/assets/d3d547e0-52fe-4600-9a5c-88b161707097";
 />

I managed to "fix" the ISO template by adding those settings in the table 
`vm_template_details`.

<img width="477" height="90" alt="image" 
src="https://github.com/user-attachments/assets/cb874e90-52ee-4d3b-91b9-7396ae214ae4";
 />

Now, any instance created from that ISO will have the appropriated setting. I 
guess there is opportunity to improve the defaults in CloudStack as it is not 
possible from the GUI when registering an ISO.

GitHub link: 
https://github.com/apache/cloudstack/discussions/12475#discussioncomment-15573905

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