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Add btrfs backup/snapshot script
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110
root/usr/local/bin/btrfs-backup
Executable file
110
root/usr/local/bin/btrfs-backup
Executable file
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#!/bin/bash
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usage() {
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cat <<EOF
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Create a btrfs snapshot
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Usage btrfs-backup <subvolume> <backup_dir> [options]
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Will create a snapshot of given subvolume in given backup_dir.
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Options:
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-h | --help: Display this message
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-t | --total: Total amount of allowed backups in the same backup_dir
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-n | --name: Name of the snapshot (appended after date)
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Example for crontab (/etc/crontab):
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15,30,45 * * * * root /usr/local/bin/btrfs-backup /.btrfs/@ /.btrfs/@snapshots/@/quaterly --total 4
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15,30,45 * * * * root /usr/local/bin/btrfs-backup /.btrfs/@home /.btrfs/@snapshots/@home/quaterly --total 4
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15,30,45 * * * * root /usr/local/bin/btrfs-backup /.btrfs/@data /.btrfs/@snapshots/@data/quaterly --total 4
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15,30,45 * * * * root /usr/local/bin/btrfs-backup /.btrfs/@log /.btrfs/@snapshots/@log/quaterly --total 4
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0 * * * * root /usr/local/bin/btrfs-backup /.btrfs/@ /.btrfs/@snapshots/@/hourly --total 8
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0 * * * * root /usr/local/bin/btrfs-backup /.btrfs/@home /.btrfs/@snapshots/@home/hourly --total 8
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0 * * * * root /usr/local/bin/btrfs-backup /.btrfs/@data /.btrfs/@snapshots/@data/hourly --total 8
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0 * * * * root /usr/local/bin/btrfs-backup /.btrfs/@log /.btrfs/@snapshots/@log/hourly --total 8
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Example for Anacrontab (/etc/anacrontab):
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@daily 10 snapshot.daily.@ /usr/local/bin/btrfs-backup /.btrfs/@ /.btrfs/@snapshots/@/daily --total 8
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@daily 10 snapshot.daily.@home /usr/local/bin/btrfs-backup /.btrfs/@home /.btrfs/@snapshots/@home/daily --total 8
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@daily 10 snapshot.daily.@data /usr/local/bin/btrfs-backup /.btrfs/@data /.btrfs/@snapshots/@data/daily --total 8
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@daily 10 snapshot.daily.@log /usr/local/bin/btrfs-backup /.btrfs/@log /.btrfs/@snapshots/@log/daily --total 8
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@weekly 20 snapshot.weekly.@ /usr/local/bin/btrfs-backup /.btrfs/@ /.btrfs/@snapshots/@/weekly --total 5
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@weekly 20 snapshot.weekly.@home /usr/local/bin/btrfs-backup /.btrfs/@home /.btrfs/@snapshots/@home/weekly --total 5
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@weekly 20 snapshot.weekly.@data /usr/local/bin/btrfs-backup /.btrfs/@data /.btrfs/@snapshots/@data/weekly --total 5
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@weekly 20 snapshot.weekly.@log /usr/local/bin/btrfs-backup /.btrfs/@log /.btrfs/@snapshots/@log/weekly --total 5
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@monthly 30 snapshot.monthly.@ /usr/local/bin/btrfs-backup /.btrfs/@ /.btrfs/@snapshots/@/monthly --total 3
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@monthly 30 snapshot.monthly.@home /usr/local/bin/btrfs-backup /.btrfs/@home /.btrfs/@snapshots/@home/monthly --total 3
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@monthly 30 snapshot.monthly.@data /usr/local/bin/btrfs-backup /.btrfs/@data /.btrfs/@snapshots/@data/monthly --total 3
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@monthly 30 snapshot.monthly.@log /usr/local/bin/btrfs-backup /.btrfs/@log /.btrfs/@snapshots/@log/monthly --total 3
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EOF
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}
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backup() {
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local now="$(date '+%Y_%M_%dT%H_%M_%S')"
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local name="$now"
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if [[ "$SNAPSHOT_NAME" ]]; then
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name="$name-$SNAPSHOT_NAME"
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fi
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btrfs subvolume snapshot -r "$SUBVOLUME" "$BACKUP_DIR/$name"
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# Clean up older snapshots
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if [[ "$TOTAL_BACKUPS" -ne 0 ]]; then
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for i in $(find "$BACKUP_DIR" -maxdepth 1 | sort | head -n -"${TOTAL_BACKUPS}"); do
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btrfs subvolume delete "$i"
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done
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fi
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}
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# Extract the last two arguments
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SUBVOLUME="$1"
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BACKUP_DIR="$2"
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shift
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shift
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if [[ -z "$SUBVOLUME" || -z "$BACKUP_DIR" ]]; then
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echo "Error: Both subvolume and backup_dir must be provided."
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usage
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exit 1
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fi
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if [[ ! -d "$SUBVOLUME" ]]; then
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echo "Error: Specified subvolume path isn't a valid directory."
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exit 1
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fi
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if [[ ! -d "$BACKUP_DIR" ]]; then
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echo "Error: Specified backup directory path isn't a valid directory."
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exit 1
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fi
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TOTAL_BACKUPS=0
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SNAPSHOT_NAME=""
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while [[ "$1" ]]; do
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case "$1" in
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-h | --help)
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usage
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exit 0
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;;
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-t | --total)
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shift
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TOTAL_BACKUPS="$1"
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shift
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;;
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-n | --name)
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shift
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SNAPSHOT_NAME="$1"
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shift
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;;
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*)
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echo "Error: Unknown argument: $1"
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usage
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exit 1
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;;
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esac
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done
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backup
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