Hi
Philip Lewis,
Welcome to Microsoft Q&A forum and thanks for using Azure Services.
As I understand, you want to know if there is a plan to add this functionality to the flexible server backup offering in Azure Database for MySQL Flexible Server.
Long-term retention (LTR) leverages full database backups to enable point in time restore (PITR). It can be beneficial for you to employ LTR for several reasons, such as auditing, compliance, or data archiving. Azure Database for MySQL (both Flexible Server and Single Server) offers a retention period up to 35 days, but there may be situations in which you want to retain the backups for longer periods. Azure offers a variety of alternatives for retaining backups for longer than 35 days.
Refer to this Blogpost
Azure Database for MySQL: Extending Long Term Retention by using containers which states how we can configure LTR for your database backups for periods longer than the 35 days provided for in Azure Database for MySQL.
Also, keep visiting our "What's New" /"Roadmap" page https://learn.microsoft.com/en-us/azure/mysql/flexible-server/whats-new for latest launched features in the product.
We also encourage you to raise your valuable feedback over the Azure Database for MySQL Feedback Channel so that concerned team could work on the feature depending upon the importance and up-votes.
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Thank you.