1. There are two ways to delete snapshots: automatic deletion by the system and manual deletion by the user.
2. Automatic deletion by the system is performed by backend services on a regular basis. When the number of snapshots for a domain exceeds 10, the earliest backup record will be deleted. Additionally, snapshots that have been backed up for over a year will also be deleted.
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# Agent Instructions: Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter:
```
GET https://dnsdoc.routerman.ecn.zenlayer.net/gettingstart/snapshot/delete-snapshot.md?ask=
```
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The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.