Nextcloud
https://nextcloud.comNextcloud is the most deployed on-premises file share and collaboration platform. ... Nextcloud provides transparent access to data on any storage.
External Storage - Nextcloud
https://nextcloud.com/storageUse Nextcloud to fine tune the balance between cost, availability, performance and security. Deploy multiple data storage systems in the public cloud or hosted with a trusted provider or on-premise. For large-scale storage solutions, performance …