Hello,
I have created a fork of apt-btrfs-snapshot for my own usage and want to propose these changes for upstream.
The code is here: https://gitlab.com/mikhailnov/apt-btrfs-snapshot Please have a look at it. Unfortunately, I have not understood how to send a pull request at Launchpad.
Changes compared to the upstream version 3.5.1:
* Systemd daily timer instead of weekly cron to clean old snapshots
* Do not run the timer when on battery (with no AC power)
* Force btrfs sync after snapshot deletions
* Introduce etc/apt-btrfs-snapshot.conf.d/ directory for config files which are loaded in alpha-numerical order
* /etc/apt-btrfs-snapshot.conf.d/10-default.conf is the default config, but other packages may put other configs into the config directory (for example, I want to override MaxAge on a group of machines and package my own config file /etc/apt-btrfs-snapshot.conf.d/20-my.conf); I will probably add such config to [system-autoupdate](https://gitlab.com/mikhailnov/system-autoupdate)
* Default MaxAge to 15 days (2 weeks + 1 day) instead of 90 days to reduce problems with no empty space left on disk
* Drop support for building with python2
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