Supports backup to external storage, SMB, WebDAV, S3, and SFTP. Compared with other similar apps, Watermelon Backup tries to offer all of these things together: 1. The code is open source, which I hope can reduce some concerns about the privacy of your photos and videos. 2. It supports multiple storage nodes. A node can be an external drive, SMB share, WebDAV server, S3-compatible bucket, or SFTP server. 3. Carefully design and implement in code, not a toy project. 4. No Subscriptions.