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Does Azure Blob storage expose S3 compatible API's?

Nope, Azure Blob Storage doesn't have an S3 API, and seems they'll never will.

rancher backup should support azure || gcs too ?

gcs supports S3, Azure is one of the few not supporting s3 which is really a standard nowadays. I guess it's something political than technical.

yeah, but I mean for the backup tool it shouldn't be that hard to support them 😛

Have you considered using your existing storage for backups? https://docs.ranchermanager.rancher.io/reference-guides/backup-restore-configuration/storage-configuration#existing-storageclass