doc-improvement: add openmediavault-backup to "new user" & "backup" sections

[mi-hol]

OMV was reviewed on 8Feb2021 in a German NAS forum
Based on feedback of tester & moderator of this forum the incorrect understanding was that OMV has no capability to backup OMV configuration but openmediavault-backup exists since a long time!

To fix this wrong conclusion documentation should be improved by adding openmediavault-backup to "new user" & "backup" sections

[mi-hol]

@votdev @ryecoaaron @flmaxey is the guide for using openmediavault-backup in the forum up-to-date so that we can add it to the official documentation?

[flmaxey]

Since that guide is from 2014 (6+ years old), I tend to think that it's probably out of date. Since it references a 3rd party package (Clonezilla) there's no way to know if it still applies without testing.

openmediavault-backup is one among a number of plugins that might benefit from a doc. I just finished a plugin doc. Time permitting, others are planned.

[PrplHaz4]

The Clonezilla guide is definitely outdated (it is now found on the "Kernel" page in OMV-Extras). The default options on the "Backup" tab work well for simple cases and are mostly self-explanatory.

It would also make more sense (IMO) to refer to this as a "System Backup", since the general term "Backup" on a NAS OS is a bit ambiguous.

1. Install OMV-Extras
2. Install openmediavault-backup plugin
3. Go to "Backup" tab
4. Select a shared folder for the destination of your system backup image, then "Save"
5. Click "Add new scheduled backup job", and select frequency and notification options, then "Save"

[ryecoaaron]

Based on feedback of tester & moderator of this forum the incorrect understanding was that OMV has no capability to backup OMV configuration but openmediavault-backup exists since a long time!

They probably say that because everyone is so used to being able to download a config file on FreeNAS and restore a system from that config. The backup plugin is really backing up the entire OS.

It would also make more sense (IMO) to refer to this as a "System Backup"

I put it in the System section of the web interface to signify that it was a system backup. If it was meant to backup data, it would have been in the Services section. That said, the actual javascript file is called SystemBackup.js - https://github.com/OpenMediaVault-Plugin-Developers/openmediavault-backup/tree/master/var/www/openmediavault/js/omv/module/admin/system/backup - not that anyone sees that.

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