Azure File Share backup to different storage account and retention > 120 days
Backup of Azure Files to a different storage account than on the one it already resides and use it for Long term Retention ( > 120)
Azure Backup now supports daily/weekly/monthly/yearly retention for Azure file share backup. So you can retain your backup data (snapshots) up to 10 years. However, the feature work for providing the ability to store backup data in a different storage account is currently in progress and the tentative ETA is mid CY 2021.