Long Full Backup
================
I have started receiving some crash screen, hte FreeBSD versioon of 
Blue Screen of Death.
In this case: a Black Screen of Death.
Following is a message I see before the system reboots:

Feb 15 16:04:50 xxxxxxx kernel: (da0:umass-sim0:0:0:0): WRITE(10). CDB: 2a 00 31
 c9 6c 80 00 00 80 00 
Feb 15 16:04:50 xxxxxxx kernel: (da0:umass-sim0:0:0:0): CAM status: CCB request 
completed with an error
Feb 15 16:04:50 xxxxxxx kernel: (da0:umass-sim0:0:0:0): Retrying command, 3 more
 tries remain
Feb 15 16:04:50 xxxxxxx kernel: (da0:umass-sim0:0:0:0): WRITE(10). CDB: 2a 00 31
 c9 6c 80 00 00 80 00 
Feb 15 16:04:50 xxxxxxx kernel: (da0:umass-sim0:0:0:0): CAM status: SCSI Status 
Error
Feb 15 16:04:50 xxxxxxx kernel: (da0:umass-sim0:0:0:0): SCSI status: Check Condi
tion

"da0" is the name of my external disk.

The disk may be about to fail, 
I don't care to buy a new disk now because SSD is expensive, and for a 
magnetic disk, I would have to open the small case and remove the fan
in order to insert another disk.  Then, to connect the fan I will have to 
buy thermal paste. So maybe buying at least a mid-tower may be a good idea.
so I back it up using the command "cp -R" to
the Micro-SD of my democratic computer, an ODroid with ubuntu on it.
I have not expected the backup to take so long.
The first thing to do is to find how to mount the destination disk.
That's easy: the file system type is "ext2fs".
During the backup, I check progress with "df" and "find ... | wc -l".
With the "find" command the process seems stuck. Well, it is just a big file, 
and next time deleting them prior to backing yo will be a great idea.
Fortunately, the backup ended without the BSoD.