IT Solutions Technology Blog

In order to backup data via SFTP you must first set up a server with SSH and let it know your public key

root@rpi-iot-jsho-rslsync-01:~# ssh-keygen -t ed25519
Generating public/private ed25519 key pair.
Enter file in which to save the key (/root/.ssh/id_ed25519):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /root/.ssh/id_ed25519
Your public key has been saved in /root/.ssh/id_ed25519.pub
The key fingerprint is:
SHA256:… root@rpi-iot-jsho-rslsync-01
The key’s randomart image is:
+–[ED25519 256]–+
…
+—-[SHA256]—–+

root@rpi-iot-jsho-rslsync-01:~#

root@rpi-iot-jsho-rslsync-01:~# ssh-copy-id -f root@192.168.1.139
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: „/root/.ssh/id_ed25519.pub“
root@192.168.1.139’s password:

Number of key(s) added: 1

Now try logging into the machine, with: „ssh ‚root@192.168.1.139′“
and check to make sure that only the key(s) you wanted were added.

root@rpi-iot-jsho-rslsync-01:~#

root@rpi-iot-jsho-rslsync-01:~# restic -r sftp:root@192.168.1.139:/mnt/restic.SFTP init
enter password for new repository:
enter password again:
created restic repository 0019da8010 at sftp:root@192.168.1.139:/mnt/restic.SFTP

Please note that knowledge of your password is required to access
the repository. Losing your password means that your data is
irrecoverably lost.

root@rpi-iot-jsho-rslsync-01:~#

root@rpi-iot-jsho-rslsync-01:~# restic -r sftp:root@192.168.1.139:/mnt/restic.SFTP backup /resilio-sync.data/USB-Stick
enter password for repository:
repository 0019da80 opened (version 2, compression level auto)
using parent snapshot 8054b3f7
[0:03] 100.00% 19 / 19 index files loaded

Files: 0 new, 0 changed, 20840 unmodified
Dirs: 0 new, 9 changed, 692 unmodified
Added to the repository: 109.729 KiB (21.324 KiB stored)

processed 20840 files, 7.382 GiB in 1:18
snapshot a16e4d8a saved

root@rpi-iot-jsho-rslsync-01:~#

To optimize restic SFTP performance using command parameters you need to target connection concurrency and pack file sizing the two most critical parameters you should append to your restic backup command are

Increase Concurrent Connections & increase the Pack Size

root@rpi-iot-jsho-rslsync-01:~# restic -r sftp:root@192.168.1.139:/mnt/restic.SFTP backup /resilio-sync.data/USB-Stick –pack-size 128 -o sftp.connections=5

root@rpi-iot-jsho-rslsync-01:~#

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