Filestash

A web file manager that presents many storage backends through a single interface, covering SFTP, S3, WebDAV, FTP, SMB, NFS, Git and local disks among others. It adds search, previews for images, video and audio, sharing links, version history and a plugin architecture, and it can also act as a gateway that exposes the same data over SFTP, FTP, S3 or WebDAV.

Teams that already keep storage in several places use it to give staff one login and one file browser instead of juggling each protocol.

Deploying it yourself keeps the credentials for every backend on your own server, and each storage target can be backed up or replicated on its own schedule.