btr-backup - backup script on btrfs
btr-backup is a simple script to backup files on btrfs with rsync. btrfs is really usefull for incremental backup with its features cow, snapshot and compression.
btrfs v2.6.32 above
"btrfs" command (from 2010-01-24 on git)
ruby (for btr-backup-clean)
(ssh for remote backup)
(sshd or rsyncd)
btr-backup <target_dir> [--rsync_options]
directory name or rsync style remote host. (e.g. /etc, remote:/var)
all arguments after target_dir will passed to rsync. (e.g. -x --exclude=/var/log)
btr-backup create backup to /backup/TARGET_HOST/TARGET_DIR. Backup steps are;
(create subvolume on /backup/TARGET_HOST/TARGET_DIR/cur)
run rsync to copy files to /backup/TARGET_HOST/TARGET_DIR/cur
snapshot from cur to YYYY-MM-DDTHH:MM:SS
And backup process is logged into /var/log/btr-backup/.
Simple one. That backups /etc to /backup/myhost/etc/;
Backup root filesystem of remote host mygw with transfer compression;
btr-backup mygw:/ -xz
Backup /var without /var/cache/* and /var/tmp/*;
btr-backup /var --exclude="/cache/*" --exclude="/tmp/*"
You can delete backup directory with "btrfs subvolume delete", like;
btrfs subvolume delete /backup/yourhost/ROOT/2010-03-10T00:00:00
Expire old backup automatically
Use "btr-backup-clean" to clenup old backup automatically.
This is cleanup all backups in default keep limit (keep 2 yearly, 6 monthly, 6 weekly and 7 daily backups).
To sure witch directories will be keeped or deleted, run with --no-act and --verbose option.
btr-backup-clean --no-act --verbose /backup/*/*
To change expire limit, add --keep option. For example 1 monthly, 3 weekly and 7 daily backups;
btr-backup-clean --keep 0Y1M3W7D /backup/*/*
And you can change limit for each host by tuning argument path;
btr-backup-clean --keep 0Y1M3W7D /backup/hostshort/* btr-backup-clean --keep 0Y0M0W365D /backup/hostdaily/*
If you need to add ssh options, you can use RSYNC_RSH environment variable or -e option.
ionice is usefull to reduce backup priority.
For remote host, use rsync option like; --rsync-path="ionice -c3 rsync"
GPL v2 or later
© 2010 Tatsuki Sugiura <email@example.com>