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Help us understand the problem. What are the problem?

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Synology NAS /dev/md0 100%

What I did

When I want to change my nas,
I use Hyper backup software to backup my nas,
Copy from my nas to USB device.

But when I run the copy task,
it tells me "Run command fail"

So I reboot the nas,
and then I see "The storage is full, you can't login." message.

Login with SSH,
I see the partation /dev/md0 100% used.

I cost a lot time to find the reason,
finally I figure it out.

Steps

Run df -h command you will see something like this,
the /dev/md0 is 100% used.

root@SynologyDS416j:/# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/md0        2.3G  1.1G  1.1G  100% /
none            1.9G     0  1.9G   0% /dev
/tmp            1.9G  2.3M  1.9G   1% /tmp
/run            1.9G  4.1M  1.9G   1% /run
/dev/shm        1.9G  548K  1.9G   1% /dev/shm
none            4.0K     0  4.0K   0% /sys/fs/cgroup
cgmfs           100K     0  100K   0% /run/cgmanager/fs
/dev/vg1000/lv  5.5T  4.3T  1.2T  80% /volume1
/dev/sdq2       7.3T  4.4T  2.9T  61% /volumeUSB1/usbshare1-2

Now the purpose is to solve this problem.

First, You can see the /dev/md0 is mounted on /,
the root folder.

It means every folder in root may used the space,
You must find it out yourself.

In my case,
the Hyper backup software copy file into /volumeUSB1 folder,
This is the problem:
the /volumeUSB1/ folder is under the /, not USB device!
The right USB device folder is /volumeUSB1/usbshare1-2/

So I delete the files under /volumeUSB1/,
and reboot nas,
I can login again.

Summary

1, Find where the /dev/md0 is mounted.
2, Find which folder used the space.
3, Delete the files.
4, Reboot.

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Help us understand the problem. What are the problem?