Creator here. I was looking for something as simple as Backblaze Personal [1] but privacy focused and open source. This is my attempt to build that.
Uses PyQt6 [2] for the GUI and Pyinstaller [3] for creating the platform specific binaries. The backup engine under the hood is Restic [4]. The server code is written in Laravel [5]. All the code is on GitHub [6].
I actually really like Backblaze (even use B2 for this offering behind the scenes) so this isn't meant to throw shade their way. Just wanted a private open source alternative. Something like Bitwarden but for backups.
[1] https://backblaze.com
[2] https://pypi.org/project/PyQt6
[3] https://pyinstaller.readthedocs.io/en/stable
[4] https://github.com/restic
[5] https://laravel.com
[6] https://github.com/blobbackup/blobbackup
Or even Restic directly: https://docs.storj.io/dcs/how-tos/backup-with-restic/