# Kopia

###### guide-by-example

![logo](https://i.imgur.com/A2mosM6.png)

WORK IN PROGRESS<br>
WORK IN PROGRESS<br>
WORK IN PROGRESS<br>

# Purpose & Overview

Backups.

* [Official site](https://kopia.io/)
* [Github](https://github.com/kopia/kopia)

Kopia is a new open source backup utility with basicly **all** modern features.</br>
Cross-platform, deduplication, encryption, compression, multithreaded speed,
native cloud storage support, GUI versions, repository replication, snapshots mounting,...

Written in golang.

In this setup kopia cli is used to backup docker containers and the host,
but general use and concepts are universal.</br>

# Some aspects of Kopia

* Kopia configuraiton uses term policies to apply to various 
  - global policy, from which repos inherit settings
  - repos policy created on repo creation
* Backup configuration is stored in a repository where backups are stored.<br>
* You connect to a repository before using it, and disconnect afterwards.<br>
  Only one repository can be connected at the time(at least for cli version).
* Currently to ignore a folder - `CACHEDIR.TAG` file can be placed inside,
  with specific [content](https://bford.info/cachedir/) 
  and set policy: `--ignore-cache-dirs true`
* Maintence is automatic
* ..

# Files and directory structure

```
/home/
│ └── ~/
│     └── docker/
│         ├── container-setup #2
│         ├── container-setup #1
│         ├── ...
│
/mnt/
│ └── mirror/
│      └── KOPIA/
│            └── arch_docker_host/
│
/opt/
  └── kopia-backup-home-etc.sh
```

only the script `kopia-backup-home-etc.sh` in /opt is created<br>
uf, systemd unit files too, but I am not "drawing" /etc/systemd/system/ up there...
even this will probably get deleted

# The setup

### install kopia

for arch linux, kopia is on AUR `yay kopia-bin`

### the initial steps


use of sudo so that kopia has access everywhere<br>

* **the policy info and change**

`sudo kopia policy get --global`<br>
`sudo kopia policy list`<br>
`sudo kopia policy set --global --ignore-cache-dirs true --keep-annual 1 --keep-monthly 6 --keep-weekly 4 --keep-daily 14 --keep-hourly 0 --keep-latest 14`<br>

* **repo creation**

`mkdir -p /mnt/mirror/KOPIA/docker_host_kopia`<br>
`sudo kopia repository create filesystem --path /mnt/mirror/KOPIA/docker_host_kopia`<br>
`sudo kopia repository connect filesystem --path /mnt/mirror/KOPIA/docker_host_kopia`<br>
`sudo kopia repository status`<br>

* **manual run**

`sudo kopia snapshot create /home/spravca/docker /etc`<br>
`sudo kopia snapshot list`<br>

* **mounting a backup**

`sudo kopia snapshot list`<br>
`sudo kopia mount k7e2b0a503edd7604ff61c68655cd5ad7 /mnt/tmp &`<br>
`sudo umount /mnt/tmp`<br>

### the backup script

`/opt/kopia-backup-home-etc.sh`
```bash
#!/bin/bash

#sudo kopia policy set --global --ignore-cache-dirs true --keep-annual 1 --keep-monthly 6 --keep-weekly 4 --keep-daily 14 --keep-hourly 0 --keep-latest 14

REPOSITORY_PATH='/mnt/mirror/KOPIA/docker_host_kopia'
BACKUP_THIS='/home /etc'
KOPIA_PASSWORD='aaa'

kopia repository connect filesystem --path $REPOSITORY_PATH --password $KOPIA_PASSWORD
kopia snapshot create $BACKUP_THIS
kopia repository disconnect
```

### Scheduled backups using systemd

Usually cron is used, but systemd provides better logging and control,
so better get used to using it.<br>
[Heres](https://github.com/kopia/kopia/issues/2685#issuecomment-1384524828)
some discussion on unit files.<br>
[ntfy](https://github.com/binwiederhier/ntfy) is used for notifications,
more info [here](https://github.com/DoTheEvo/selfhosted-apps-docker/tree/master/gotify-ntfy-signal#linux-systemd-unit-file-service)

```kopia-home-etc.service```
```ini
[Unit]
Description=kopia backup
Wants=network-online.target
After=network-online.target
ConditionACPower=true
# OnFailure=ntfy@failure-%p.service
# OnSuccess=ntfy@success-%p.service

[Service]
Type=oneshot

# Lower CPU and I/O priority.
Nice=19
CPUSchedulingPolicy=batch
IOSchedulingPriority=7

IPAccounting=true
PrivateTmp=true
Environment="HOME=/root"

ExecStart=/opt/kopia-backup-home-etc.sh
```


```kopia-home-etc.timer```
```ini
[Unit]
Description=Run kopia backup

[Timer]
OnCalendar=*-*-* 02:00:00
RandomizedDelaySec=10min
Persistent=true

[Install]
WantedBy=timers.target
```

# Mounting network storage using systemd

* files are placed in `/etc/systemd/system`
* the name of mount and automount files MUST correspond with the path<br>
  replacing `/` with a `-`,
  but otherwise it must be the mounting path in the name
* for mounting that does not fail on boot if there are network issues,
  and mounts the target only on request - enable `automount` file,
  not `mount` file, so:<br>
  `sudo systemctl enable mnt-mirror.automount`

`mnt-mirror.mount`
```ini
[Unit]
Description=3TB truenas mirror mount

[Mount]
What=//10.0.19.11/Mirror
Where=/mnt/mirror
Type=cifs
Options=rw,username=kopia,password=aaa,file_mode=0644,dir_mode=0755,uid=1000,gid=1000

[Install]
WantedBy=multi-user.target
```

`mnt-mirror.automount`
```ini
[Unit]
Description=3TB truenas mirror mount

[Automount]
Where=/mnt/mirror

[Install]
WantedBy=multi-user.target
```

# Remote backup

...  some day ...

# Kopia in Windows

While GUI version seems like a way to go.. its not there yet.
The way the schedule is running - it uses is running only under a user, theres no certainty it will run.

So here goes cli version

* [download](https://github.com/kopia/kopia/releases/) latest named  kopia-X.XX.X-windows-x64.zip
, \~11MB
* extract, move to `C:\kopia`
* download `win_vss_before.ps1` and `win_vss_after.ps1` from this repo,
  or crete them from
  [here](https://kopia.io/docs/advanced/actions/#windows-shadow-copy)
* kopia-backup-home-etc.sh

* powershell as as administrator
* --enable-actions
* in tray, right click on the icon - `Launch At Startup`<br>
  this creates registry entry - *HKCU\Software\Microsoft\Windows\CurrentVersion\Run\KopiaUI*
* 

kopia policy set <target_dir> --before-folder-action "powershell -WindowStyle Hidden <path_to_script>\before.ps1"
kopia policy set <target_dir> --after-folder-action  "powershell -WindowStyle Hidden <path_to_script>\after.ps1"
