If considering file types such as documents or attachments, which API would you select for backup?

The REST API is particularly suitable for managing file types such as documents and attachments during backup operations. It provides a straightforward and efficient way to interact with Salesforce data through modern web standards, allowing easy integration of file uploads and downloads. The REST API supports specific endpoints that facilitate the direct handling of files, making it ideal for operations that require accessing and backing up files stored within Salesforce.

Moreover, while other APIs like the Metadata API can be used for managing configuration metadata within Salesforce and the Bulk API is designed for handling large volumes of records in a more efficient manner, these APIs do not specialize in handling files and attachments directly. The SOAP API, while also capable of accessing records, lacks the flexibility and simplicity of the REST API when it comes to file handling, especially in scenarios involving frequent or smaller transactions, which are common in backup processes.

Therefore, the REST API stands out as the most efficient option for backing up file types, as it offers a balance of ease of use, modern capabilities, and web-based interactions that optimize the experience of dealing with documents and attachments.