Data at rest in information technology means inactive data that is stored physically in any digital form (for example; databases, data warehouses, spreadsheets, archives, tapes, off-site backups, mobile devices etc.)
Kindly check the link.
https://brightlineit.com/encryption-at-rest-important-business/#:~:text=You%20definitely%20don't%20want,into%20another%20form%20of%20data.&text=Only%20authorized%20 .
https://brightlineit.com/encrypting-data-at-rest/ .
https://blog.ipswitch.com/encryption-at-rest-isnt-good-enough .
https://www.ryadel.com/en/data-encryption-in-transit-at-rest-definitions-best-practices-tutorial-guide/
It is necessary to encrypt any data that you do not want to be taken over by someone else.
Yes, all data need protection including data at rest. Anyone can come across the data and your data will be gone. The main reason of encryption is to protect the data from being used by a person who was not intended to use it.
Should organizations still invest in security technologies (for data at rest) that might even expire and need updates(more expenditure)?
Should funds really be used on that or just use complete offline storage and focus on the active data?
Data at rest must be protected with either encryptions, truncation, tokenization, proper access controls etc. because of the following reasons:
1. To avoid data theft or unauthorized access
2. Data Privacy
3. Regulatory requirements.
4. Operational and Financial loss leading to Reputational loss.
Also there are other reasons which will depend on types of data such as personal data, Cardholder data etc. being stored.
Yes, it is essential to encrypt data at rest. It is a bit difficult to explain the necessity of encryption at rest briefly. The following link may clear all of your doubts.
https://docs.microsoft.com/en-us/azure/security/fundamentals/encryption-atrest
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