You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.

btrfs-backup-ng
0.4.0

This version was deleted from PyPI around 2023-12-27. Installing fails with:
$ pip3 install btrfs-backup-ng==0.4.0 ERROR: Could not find a version that satisfies the requirement btrfs-backup-ng==0.4.0
View other deleted versions of btrfs-backup-ng

Install through StableBuild

You can install this package from StableBuild's PyPI snapshots from before the version was deleted:
pip3 install \ -i https://YOUR_API_KEY.pypimirror.stablebuild.com/2023-12-25/ \ btrfs-backup-ng==0.4.0
Sign up for StableBuild to get an API key (it's free and takes <60 seconds!)

Or, download files manually

And install manually via pip:
btrfs_backup-ng-0.4.0.tar.gz (26.5KB)