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Add btrfs backup/snapshot script

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ItsDrike 2024-01-26 00:32:51 +01:00
parent dc4d6fd43f
commit d7bf3a044d
Signed by: ItsDrike
GPG key ID: FA2745890B7048C0
1 changed files with 110 additions and 0 deletions
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root/usr/local/bin/btrfs-backup Executable file
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#!/bin/bash
usage() {
cat <<EOF
Create a btrfs snapshot
Usage btrfs-backup <subvolume> <backup_dir> [options]
Will create a snapshot of given subvolume in given backup_dir.
Options:
-h | --help: Display this message
-t | --total: Total amount of allowed backups in the same backup_dir
-n | --name: Name of the snapshot (appended after date)
Example for crontab (/etc/crontab):
15,30,45 * * * * root /usr/local/bin/btrfs-backup /.btrfs/@ /.btrfs/@snapshots/@/quaterly --total 4
15,30,45 * * * * root /usr/local/bin/btrfs-backup /.btrfs/@home /.btrfs/@snapshots/@home/quaterly --total 4
15,30,45 * * * * root /usr/local/bin/btrfs-backup /.btrfs/@data /.btrfs/@snapshots/@data/quaterly --total 4
15,30,45 * * * * root /usr/local/bin/btrfs-backup /.btrfs/@log /.btrfs/@snapshots/@log/quaterly --total 4
0 * * * * root /usr/local/bin/btrfs-backup /.btrfs/@ /.btrfs/@snapshots/@/hourly --total 8
0 * * * * root /usr/local/bin/btrfs-backup /.btrfs/@home /.btrfs/@snapshots/@home/hourly --total 8
0 * * * * root /usr/local/bin/btrfs-backup /.btrfs/@data /.btrfs/@snapshots/@data/hourly --total 8
0 * * * * root /usr/local/bin/btrfs-backup /.btrfs/@log /.btrfs/@snapshots/@log/hourly --total 8
Example for Anacrontab (/etc/anacrontab):
@daily 10 snapshot.daily.@ /usr/local/bin/btrfs-backup /.btrfs/@ /.btrfs/@snapshots/@/daily --total 8
@daily 10 snapshot.daily.@home /usr/local/bin/btrfs-backup /.btrfs/@home /.btrfs/@snapshots/@home/daily --total 8
@daily 10 snapshot.daily.@data /usr/local/bin/btrfs-backup /.btrfs/@data /.btrfs/@snapshots/@data/daily --total 8
@daily 10 snapshot.daily.@log /usr/local/bin/btrfs-backup /.btrfs/@log /.btrfs/@snapshots/@log/daily --total 8
@weekly 20 snapshot.weekly.@ /usr/local/bin/btrfs-backup /.btrfs/@ /.btrfs/@snapshots/@/weekly --total 5
@weekly 20 snapshot.weekly.@home /usr/local/bin/btrfs-backup /.btrfs/@home /.btrfs/@snapshots/@home/weekly --total 5
@weekly 20 snapshot.weekly.@data /usr/local/bin/btrfs-backup /.btrfs/@data /.btrfs/@snapshots/@data/weekly --total 5
@weekly 20 snapshot.weekly.@log /usr/local/bin/btrfs-backup /.btrfs/@log /.btrfs/@snapshots/@log/weekly --total 5
@monthly 30 snapshot.monthly.@ /usr/local/bin/btrfs-backup /.btrfs/@ /.btrfs/@snapshots/@/monthly --total 3
@monthly 30 snapshot.monthly.@home /usr/local/bin/btrfs-backup /.btrfs/@home /.btrfs/@snapshots/@home/monthly --total 3
@monthly 30 snapshot.monthly.@data /usr/local/bin/btrfs-backup /.btrfs/@data /.btrfs/@snapshots/@data/monthly --total 3
@monthly 30 snapshot.monthly.@log /usr/local/bin/btrfs-backup /.btrfs/@log /.btrfs/@snapshots/@log/monthly --total 3
EOF
}
backup() {
local now="$(date '+%Y_%M_%dT%H_%M_%S')"
local name="$now"
if [[ "$SNAPSHOT_NAME" ]]; then
name="$name-$SNAPSHOT_NAME"
fi
btrfs subvolume snapshot -r "$SUBVOLUME" "$BACKUP_DIR/$name"
# Clean up older snapshots
if [[ "$TOTAL_BACKUPS" -ne 0 ]]; then
for i in $(find "$BACKUP_DIR" -maxdepth 1 | sort | head -n -"${TOTAL_BACKUPS}"); do
btrfs subvolume delete "$i"
done
fi
}
# Extract the last two arguments
SUBVOLUME="$1"
BACKUP_DIR="$2"
shift
shift
if [[ -z "$SUBVOLUME" || -z "$BACKUP_DIR" ]]; then
echo "Error: Both subvolume and backup_dir must be provided."
usage
exit 1
fi
if [[ ! -d "$SUBVOLUME" ]]; then
echo "Error: Specified subvolume path isn't a valid directory."
exit 1
fi
if [[ ! -d "$BACKUP_DIR" ]]; then
echo "Error: Specified backup directory path isn't a valid directory."
exit 1
fi
TOTAL_BACKUPS=0
SNAPSHOT_NAME=""
while [[ "$1" ]]; do
case "$1" in
-h | --help)
usage
exit 0
;;
-t | --total)
shift
TOTAL_BACKUPS="$1"
shift
;;
-n | --name)
shift
SNAPSHOT_NAME="$1"
shift
;;
*)
echo "Error: Unknown argument: $1"
usage
exit 1
;;
esac
done
backup