how to make full backup openvediavault from SDcard ?

I just copy over all the data to another NAS, using rsync. Every day.

Well, actually I use rsync in a script to every day create a new snapshot on another NAS. The snapshots "reuse" unchanged files by hardlinking, so each snapshot (almost) only takes up space for new and changed files. Also by using rsync only new and changed files have to be copied between the NAS, so it is usually very fast.

And my script also deletes old snapshots so I only retain a certain number of daily, weekly and monthly snapshots.

And I have my NAS do this automatically every night, so I don't have to remember to do it.

Newbie trying to build a little NAS for family photos

I also backup the SD card. I don't use the SD card to store data, or at least as little as possible. I only use the SD card for boot and root filesystem with the operating system and OMV. That way I don't have to back it up often, because nothing important change on the card. Except when I reconfigure or update.

I remove the card and use my laptop to create cloned images of the partitions and other stuff on the card. When needed I can write these images to a new card. I update the cloned images before and after major updates and changes. That way, if something breaks, I can easily recover.

New to OMV and Linux

There are many, many other methods to backup data. You need to find one you are comfortable with.

I assume you mean the SD card which is running the OS.

If you use the backup-plugin, make sure you test the restore. Depending on your skills this can be a challenge.

Alternative is to clone the SD card with some Windows Tool, Clonezilla, fsarchiver etc.

Quote from RedpaX

its too hard for my

There's a process on page 71 (Cloning Flash Media), in the current OMV5 new user guide.