Bluefactory backup supports Attachment, MailmergeTemplate, StaticResource, and Document. 

In order to minimize API calls and to avoid hitting salesforce limits, Bluefactory downloads and backs up your attachments incrementally at a default rate of 10,000 files per backup (you can modify the number of files per day by contacting us).

Once all your files have been successfully backed-up, only files that have changed since the last backup will be downloaded (incrementally).

For example, if your Salesforce Org has 1 million file attachments, backup of your attachments will complete within 100 days with a daily backup. 

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