Under DSM5, the previous version of Synology’s operating system , a software called “Backup and Replication” allowed backups to an external volume in the file format of your choice (NTFS, HFS+, ext4, etc.). You could navigate within that volume’s tree and browse within folders to extract whatever file you needed.
Since DSM6, backups are managed by HyperBackup to save one
NAS to another one, encrypt a backup instead of a whole hard drive to protect the files, time stamp versions of the backup, etc. It creates a container file (.hbk), fragments files in a specific format (.bkpi) that remain unreadable unless you install Hyperbackup Explorer.
Hyperbackup Explorer is the desktop tool for browsing, decrypting, and extracting different versions of backup data in Hyper Backup repositories .It is available for Windows, Mac, and Linux.
Installation
Upon download, the package must be extracted.
Windows : following extraction,drop the whole folder containing the application in your programs folder and create a shortcut to launch launch it, locate the backup folder and select it for file extraction.
Mac : drag the downloaded application and drop it in the applications folder and launch it, locate the backup folder and select it for file extraction
Linux : following installation, navigate to /media/username/disk number/SynologyHyperBackup.bkpi in order to access the folder containing the backup.