How to make a backup of the system and all settings?

How to make a backup of the system and all settings?

Should it be done?

Because if you only have disks connected and MD RAID, even if something happens, you can easily mount it in another system.

It's probably worse if you have add-ons like k8s for containers or OMV-extra compose for docker or kvm or others that need additional configuration.

Because I think what we set in these containers stays there, so we can stop them and then turn them on and they will keep e.g. our password.

I have data for compose (shared folder, data and backup) on the disk with the system, if that changes anything.

Turn on OMV and connect Clonezilla to make copies?

Can you give the command because when it finds it mainly copies it, i.e. sudo dd if=/dev/sda of=/dev/sdb

Then add it to System->Scheduled Tasks?

Quote from gderf

Change of= to a filename, instead of a device.

For something like this dd if=/dev/sda of=/dev/backup ?

Why are there tools like clonezilla when dd is built into every Linux and it can handle it and you don't have to turn on the machine to load the system?

Quote from ryecoaaron

You can't copy the system disk to another disk and leave it plugged in. you will have multiple filesystems with the same uuid. If you want to backup to a file, just use the openmediavault-backup plugin and choose the ddfull option.

In the backup plugin I can only select a shared folder.

Should I share /?

It's not, I don't know, not safe?

In the shared folder, should I enter / in the relative path because I can't select from the list of existing folders?

DD doesn't copy sector by sector and doesn't know what free space is in the file system?

So if we have a 1 TB disk where OMV has 30 GB, docker 10 GB and kvm 40 GB.

So instead of making a copy of only 80 GB, will it make an image that will be 1 TB?

Unless we make partitions, e.g. 200 GB for the whole thing, but I don't know if OMV has such an option in the installer (I haven't installed it for a long time), because Debian does.

I know that you can do it from the console like everything else on Debian because that's where OMV is, but I wouldn't want to do it because I'd be afraid that it would mess something up and I'd have to set up OMV or Docker again.

Quote from gderf

So, what in your use case justifies installing OMV to a 1TB disk?

Quote from ryecoaaron

The idea of OMV is to not put data on the OS disk. Then you don't lose data if the OS disk fails. Using a 1TB disk for the OS is too big.

I have 1 TB because I had it at hand.

I keep data on two disks in a raid.

I have the docker plugin installed and as I wrote in the first post I have folders from the plugin indicated on the disk/partitions with os/OMV.

I did not install the KVM plugin so I do not know how to set it up, but I also assumed that I would set it to the disk with OMV.

I did not want to have Dockers on the disk with data because I did not really understand this technology and that it could somehow affect my data on this disk. I assumed that KVM would not be turned on all the time or that I would turn them off from time to time to make a copy of the machine like in virtualbox, where it is probably enough to copy the disk, of course it will not hold, I do not know how many CPUs were assigned.

The disk in the raid works

And another reason why I didn't want to have docker or virtual machines on RAID is because I set the disks to turn off when they don't work for 30 minutes, they turn off, I know that in theory the disk breaks down most often when starting up or at least that's what they say but they work in raid 1 so if one disk breaks down there is a copy on the other and I think it's easy (because I didn't add it) to add a new disk to the existing raid 1.

Raid works under ext4 so the folders from docker can be there because on the page

Quote from https://wiki.omv-extras.org/doku.php?id=omv6:docker_in_omv#basic_concepts

As a general rule we will choose a drive with an EXT4 file system.

and for kvm I don't know

And how do I restore a copy made by dd or a plugin?

How do I make a copy of docekra containers from a plugin?

Is it possible to simply copy virtual machine images?

Quote from ryecoaaron

There are many threads on this. Please search.

The internet is full of garbage and I don't know which ones are good.

Quote from ryecoaaron

What do you mean by "copy"? I don't know anything about docekra but you typically don't copy a container.

The containers themselves are probably short-lived but you can probably add a folder where the data is saved permanently.

Isn't there any general instructions on how to save container data settings?

Each container, whether it's pi hole or jalyfin, has it solved differently, where it stores configuration data and you have to approach each one individually?

Is it possible to save only this file from compose?