restic for Yunohost

A restic package for YunoHost (heavily inspired by the Borg package).

Restic is a backup tool that can make local and remote backups. This package uses restic to make backups to a sftp server.

Usage

If you want to backup your server A onto the server B.

Setup restic app on Server A

Firstly set up this app on the server A you want to backup:

$ yunohost app install https://github.com/YunoHost-Apps/restic_ynh
Indicate the server where you want put your backups: serverb.domain.tld
sftp port of your server (default: 22): 2222
The directory where you want your backup repositories to be created in (default: ./): ./servera.domain.tld
Indicate the ssh user to use to connect on this server: servera
You are now about to define a new user password. The password should be at least 8 characters - though it is good practice to use longer password (i.e. a passphrase) and/or to use various kind of characters (uppercase, lowercase, digits and special characters).
Indicate a strong passphrase, that you will keep preciously if you want to be able to use your backups:
Would you like to backup your YunoHost configuration ? [yes | no] (default: yes):
Would you like to backup mails and user home directory ? [yes | no] (default: yes):
Which apps would you backup (list separated by comma or 'all') ? (default: all): gitlab,blogotext,sogo
Allow backup method to temporarily use more space? [yes | no] (default: yes):
Indicate the backup frequency (see systemd OnCalendar format) (default: Daily): *-*-* 0:05
Indicate the backup check frequency (see systemd OnCalendar format) (default: *-*-8,15,22 3:15:00):
Indicate the complete backup check frequency (see systemd OnCalendar format) (default: *-*-1 1:15:00):

You can schedule your backup by choosing an other frequency. Some example:

Monthly :

Weekly :

Daily : Daily at midnight

Hourly : Hourly o Clock

Sat --1..7 18:00:00 : The first saturday of every month at 18:00

4:00 : Every day at 4 AM

5,17:00 : Every day at 5 AM and at 5 PM

See here for more info : https://wiki.archlinux.org/index.php/Systemd/Timers#Realtime_timer

After each invocation an e-mail will be sent to root@yourdomain.tld with the execution log.

Restic can check backups consistency and verify the actual backed up data has not been modified. If you use the default values for the backup checks frequencies, a full check will be made on the first day of each month and a simple check will be made on each one of the three remaining weeks of the month.

At the end of the installation, the app displays the public_key and the user to give to the person who has access to the server B.

You should now authorize the public key for user servera on server B by logging into server B with user servera and running:

mkdir ~/.ssh -p 2>/dev/null
touch ~/.ssh/authorized_keys
chmod u=rw,go= ~/.ssh/authorized_keys
cat << EOPKEY >> ~/.ssh/authorized_keys
<paste here the privakey displayed at the end of installation>
EOPKEY

If you don't find the mail and you don't see the message in the log bar you can find the public_key with this command:

cat /root/.ssh/id_restic_ed25519.pub

(Optional) set sftp jail on server B

To improve security, make sure user servera can only do sftp and can only access his home directory on server B. This is how you would do it on Debian/Ubuntu, otherwise refer to your distribution manual (don't forget to replace servera with the real username)

cat << EOCONFIG >> /etc/ssh/sshd_config
Match User servera
   ChrootDirectory %h
   ForceCommand internal-sftp
   AllowTcpForwarding no
   X11Forwarding no
EOCONFIG
service ssh restart

Test

At this step your backup should schedule.

If you want to be sure, you can test it by running on server A:

systemctl start restic.service

Next you can verify the backup contents by running on server A

restic -r sftp:serverb.domain.tld:servera.domain.tld/auto_conf snapshots

Replace auto_conf with auto_<app> if you did not choose to backup configuration but only applications.

If you want to check the backups consistency:

systemctl start restic_check.service

If you want to make a complete check of the backups - keep in mind that this reads all the backed up data, it can take some time depending on your target server upload speed (more on this topic in the restic documentation:

systemctl start restic_check_read_data.service

Edit the apps list to backup

yunohost app setting restic apps -v "nextcloud,wordpress"

Backup on different server, and apply distinct schedule for apps

You can setup the restic app several times on the same server so you can backup on several server or manage your frequency backup differently for specific part of your server.

TODO

• Remove expect message when question was not matched