Rsnapshot is an rsync-based filesystem snapshot utility. It can take incremental backups of local and remote filesystems for any number of machines. Rsnapshot makes extensive use of hard links, so disk space is only used when absolutely necessary. It leverages the power of rsync to create scheduled, incremental backups.
To install it open a terminal shell and run:
sudo apt-get install rsnapshot
If you want to backup a remote filesystem the rsnapshot server needs to be able to access the target machine over SSH without password. For more information on how to enable it please see OpenSSH documentation. If the backup target is a local filesystem there is no need to set up OpenSSH.
The rsnapshot configuration resides in
/etc/rsnapshot.conf. Below you can find some of the options available there.
The root directory where all snapshots will be stored:
How many old backups you would like to keep. Since rsnapshot uses incremental backups, we can afford to keep older backups for awhile before removing them. You set these up under the
BACKUP LEVELS / INTERVALS section. You tell rsnapshot to retain a specific number of backups of each kind of interval.
retain daily 6 retain weekly 7 retain monthly 4
In this example we will keep 6 snapshots of our daily strategy, 7 snapshots of our weekly strategy, and 4 snapshots of our monthly strategy. These data will guide the rotation made by rsnapshot.
If you are accessing a remote machine over SSH and the port to bind is not the default (port
22), you need to set the following variable with the port number:
ssh_args -p 22222
And the most important part, you need to decide on what you would like to backup. If you are backing up locally to the same machine, this is as easy as specifying the directories that you want to save and following it with
localhost/ which will be a sub-directory in the
snapshot_root that you set up earlier.
backup /home/ localhost/ backup /etc/ localhost/ backup /usr/local/ localhost/
If you are backing up a remote machine you just need to tell rsnapshot where the server is and which directories you would like to back up.
backup firstname.lastname@example.org:/home/ example.com/ +rsync_long_args=--bwlimit=16,exclude=core backup email@example.com:/etc/ example.com/ exclude=mtab,exclude=core
As you can see you can see you can pass extra rsync parameters (the
+ append the parameter to the default list, if you remove the
+ sign you override it) and also exclude directories.
You can check the comments in
/etc/rsnapshot.conf and the rsnapshot man page for more options.
After modifying the configuration file is a good practice to check if the syntax is ok:
sudo rsnapshot configtest
You can also test your backup levels with the following command:
sudo rsnapshot -t daily
If you are happy with the output and want to see it in action you can run:
sudo rsnapshot daily
With rsnapshot working correctly with the current configuration, the only thing left to do is to schedule it to run at certain intervals. We will use cron to make this happen since rsnapshot includes a default cron file in
/etc/cron.d/rsnapshot. If you open this file there are some entries commented out as reference.
0 4 * * * root /usr/bin/rsnapshot daily 0 3 * * 1 root /usr/bin/rsnapshot weekly 0 2 1 * * root /usr/bin/rsnapshot monthly
The settings above added to
- the daily snapshot everyday at 4:00 am
- the weekly snapshot every Monday at 3:00 am
- the monthly snapshot on the first of every month at 2:00 am
For more information on how to schedule a backup using cron please take a look at
Executing with cron section in Backups - Shell Scripts.
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