How to use Duplicity in Linux

You will receive an output as follows.

We need to generate a lot of random bytes. It is a good idea to perform
some other action (type on the keyboard, move the mouse, utilize the
disks) during the prime generation  this gives the random number
generator a better chance to gain enough entropy.
gpg: /root/.gnupg/trustdb.gpg: trustdb created
gpg: key 7DB2D34A marked as ultimately trusted
public and secret key created and signed.
gpg: checking the trustdb
gpg: 3 marginal(s) needed, 1 complete(s) needed, PGP trust model
gpg: depth: 0 valid: 1 signed: 0 trust: 0-, 0q, 0n, 0m, 0f, 1u
pub 2048R/7DB2D34A 2016-05-20
Key fingerprint = D671 674C F48A 391E 579A 8FC8 EE43 BB54 7DB2 D34A
uid linuxhelp
sub 2048R/C18FCF85 2016-05-20

List the keys, once it has been generated.

[root@linuxhelp ~]# gpg --list-keys
/root/.gnupg/pubring.gpg
------------------------
pub 2048R/7DB2D34A 2016-05-20
uid linuxhelp
sub 2048R/C18FCF85 2016-05-20

Public key ID (7DB2D34A) is highlighted in the above output.

To Create a backup with Duplicity

Backup the ' /var/log' directory, with the exception of ' /var/log/anaconda' and ' /var/log/sa' .

Syntax
PASSPHRASE=" YourPassphraseHere" duplicity --encrypt-key YourPublicKeyIdHere --exclude /var/log/anaconda --exclude /var/log/sa /var/log scp://root@RemoteServerIP:port//localbackup/files

[root@linuxhelp ~]# PASSPHRASE=" linuxhelp"  duplicity --encrypt-key 7DB2D34A --exclude /var/log/anaconda --exclude /var/log/sa /var/log scp://root@192.168.5.89:22//localbackup/files
Duplicity 0.6 series is being deprecated:
See http://www.nongnu.org/duplicity/
The authenticity of host ' 192.168.5.89'  can' t be established.
SSH-RSA key fingerprint is 68:9a:c8:6f:bd:41:e2:84:18:8f:4a:7d:cb:45:7a:b1.
Are you sure you want to continue connecting (yes/no)? yes
Local and Remote metadata are synchronized, no sync needed.
Last full backup date: none
No signatures found, switching to full backup.
--------------[ Backup Statistics ]--------------
StartTime 1463744436.19 (Fri May 20 17:10:36 2016)
EndTime 1463744436.81 (Fri May 20 17:10:36 2016)
ElapsedTime 0.62 (0.62 seconds)
SourceFiles 41
SourceFileSize 1352942 (1.29 MB)
NewFiles 41
NewFileSize 1352942 (1.29 MB)
DeletedFiles 0
ChangedFiles 0
ChangedFileSize 0 (0 bytes)
ChangedDeltaSize 0 (0 bytes)
DeltaEntries 41
RawDeltaSize 1348590 (1.29 MB)
TotalDestinationSizeChange 144862 (141 KB)
Errors 0
-------------------------------------------------

The backup is stored in the path ' /localbackup/files' . Verify it on the backup server by running the following command.

[root@linuxhelp ~]# ls /localbackup/files/
duplicity-full.20160520T114036Z.manifest.gpg duplicity-full-signatures.20160520T114036Z.sigtar.gpg
duplicity-full.20160520T114036Z.vol1.difftar.gpg

To Restore Backup

Delete yum.log in directory /var/log of the local server to make sure that the backup file doesn' t exist.

[root@linuxhelp ~]# cd /var/log
[root@linuxhelp log]# ls
anaconda btmp cups gdm maillog pm-powersave.log sa speech-dispatcher tuned Xorg.0.log.old
audit chrony dmesg lastlog messages ppp samba spooler wtmp Xorg.9.log
boot.log cron dmesg.old libvirt pluto qemu-ga secure tallylog Xorg.0.log yum.log

[root@linuxhelp log]# rm -rf yum.log
[root@linuxhelp log]# ls
anaconda btmp cups gdm maillog pm-powersave.log sa speech-dispatcher tuned Xorg.0.log.old
audit chrony dmesg lastlog messages ppp samba spooler wtmp Xorg.9.log
boot.log cron dmesg.old libvirt pluto qemu-ga secure tallylog Xorg.0.log

Run the following command to restore a single file from remote server.

Syntax
# PASSPHRASE=" YourPassphraseHere" duplicity --file-to-restore filename sftp://root@RemoteHostIP//localbackup/files /where/to/restore/filename

[root@linuxhelp log]# PASSPHRASE=" linuxhelp"  duplicity --file-to-restore yum.log sftp://root@192.168.5.89:22//localbackup/files /var/log/yum.log
Duplicity 0.6 series is being deprecated:
See http://www.nongnu.org/duplicity/
Synchronizing remote metadata to local cache...
Copying duplicity-full-signatures.20160520T114036Z.sigtar.gpg to local cache.
Copying duplicity-full.20160520T114036Z.manifest.gpg to local cache.
Last full backup date: Fri May 20 17:10:36 2016
Other Features of Duplicity:

By using the following command you may display list of archived files.

[root@linuxhelp ~]# duplicity list-current-files sftp://root@192.168.5.89:22//localbackup/files

For deleting 6 months older backups, run the following command.

[root@linuxhelp ~]# duplicity remove-older-than 6M sftp://root@192.168.5.89:22//localbackup/files