|How to make per-application backups|
Multiple backup configurations
You may find yourself wanting to create different backup policies for different applications on your system. For instance, you may want one backup configuration for your database data directory, and a different configuration for your user home directories.
The way to accomplish that is pretty simple: Create multiple separate
configuration files and place each one in a
/etc/borgmatic.d/ directory. For
sudo mkdir /etc/borgmatic.d sudo generate-borgmatic-config --destination /etc/borgmatic.d/app1.yaml sudo generate-borgmatic-config --destination /etc/borgmatic.d/app2.yaml
When you set up multiple configuration files like this, borgmatic will run
each one in turn from a single borgmatic invocation. This includes, by
default, the traditional
/etc/borgmatic/config.yaml as well.
And if you need even more customizability, you can specify alternate
configuration paths on the command-line with borgmatic's
borgmatic --help for more information.
Once you have multiple different configuration files, you might want to share common configuration options across these files with having to copy and paste them. To achieve this, you can put fragments of common configuration options into a file, and then include or inline that file into one or more borgmatic configuration files.
Let's say that you want to include common retention configuration across all of your configuration files. You could do that in each configuration file with the following:
location: ... retention: !include /etc/borgmatic/common_retention.yaml
And then the contents of
common_retention.yaml could be:
keep_hourly: 24 keep_daily: 7
To prevent borgmatic from trying to load these configuration fragments by
themselves and complaining that they are not valid configuration files, you
should put them in a directory other than
/etc/borgmatic.d/. (A subdirectory
Note that this form of include must be a YAML value rather than a key. For example, this will not work:
location: ... # Don't do this. It won't work! !include /etc/borgmatic/common_retention.yaml
But if you do want to merge in a YAML key and its values, keep reading!
If you need to get even fancier and pull in common configuration options while
potentially overriding individual options, you can perform a YAML merge of
included configuration using the YAML
<< key. For instance, here's an
example of a main configuration file that pulls in two retention options via
an include, and then overrides one of them locally:
location: ... retention: keep_daily: 5 <<: !include /etc/borgmatic/common_retention.yaml
This is what
common_retention.yaml might look like:
keep_hourly: 24 keep_daily: 7
Once this include gets merged in, the resulting configuration would have a
keep_hourly value of
24 and an overridden
keep_daily value of
When there is a collision of an option between the local file and the merged include, the local file's option takes precedent. And note that this is a shallow merge rather than a deep merge, so the merging does not descend into nested values.