Define how quickly you need each system back (RTO - e.g., email must be up in 4 hours) and how much data you can lose (RPO - e.g., maximum 15 minutes of lost transactions).
Many countries have laws requiring that standards referenced in regulations be publicly accessible for reading. For example: iso 27031 standard pdf free
The standard was recently updated in to better address modern challenges like cloud service dependencies and advanced cybersecurity threats. Key Components of the Standard Define how quickly you need each system back (RTO - e
The you are securing (e.g., small business, large enterprise). Whether you are preparing for a formal audit . iso 27031 standard pdf free
Here are some free PDF resources where you can find more information on ISO 27031:
Searching for often leads to dangerous corners of the web: