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42 lines
1.3 KiB
Nix
42 lines
1.3 KiB
Nix
# For each instance, a service and timer will be created:
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# systemctl list-unit-files | grep btrbk
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# #=> btrbk-<instance-name>.service
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# #=> btrbk-<instance-name>.timer
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#
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# If onCalendar is set to `null`, one can manually execute btrbk with
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# sudo systemctl start btrbk-<instance-name>.service
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# Print generated systemd unit file
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# cat "$(systemctl show -P FragmentPath btrbk-<instance-name>.service)"
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# #=> ExecStart=/nix/store/53nvbl1c0w14524j7v3fpn9py31yi2hb-btrbk-0.32.6/bin/btrbk -c /etc/btrbk/local-backup.conf run
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{ config, pkgs, ... }:
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{
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imports = [
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./snapshot.nix
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./backup.nix
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];
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# Compression
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#
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# `btrbk` can be configured to either
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# - compress the BTRFS data stream itself
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# - or to enable SSH compression
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#
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# The latter supports only ZLIB (LZ77) compression, see https://www.ietf.org/rfc/rfc4253.txt
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# Thus, we choose the first option instead.
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#
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# lz4 is a good option, but zstd-9 seems to be better in the mean time.
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#
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# Install the compression package so that other hosts can pull compressed snapshots from us.
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environment.systemPackages = [
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pkgs.zstd
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];
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services.btrbk = {
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# Lowest scheduling priority.
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niceness = 19;
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# The `instances` option is set by `./snapshot.nix` and `./backup.nix`.
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};
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}
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