What is backup_vg-backup? Can it be so big?

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	On a System76 PC several years old, running F32 fully updated (not 
Ubuntu), I see the following:

$ df -h
Filesystem                    Size  Used Avail Use% Mounted on
devtmpfs                      7.8G     0  7.8G   0% /dev
tmpfs                         7.8G     0  7.8G   0% /dev/shm
tmpfs                         7.8G  1.6M  7.8G   1% /run
/dev/mapper/fedora-root        49G   16G   31G  35% /
tmpfs                         7.8G   60K  7.8G   1% /tmp
/dev/mapper/fedora-home        52G   20G   30G  40% /home
/dev/sda1                     976M  252M  658M  28% /boot
/dev/mapper/backup_vg-backup  1.8T  174M  1.7T   1% /.snapshots
tmpfs                         1.6G   60K  1.6G   1% /run/user/65536
bash-5.0$ 

	Going into the GUI, right clicking and choosing priorities, I see:

 Link to block device (inode/blockdevice)

	So I searched inode, but got over my head in no time. Searching 
snapshot was a little more comprehensible, but using what I think it told 
me would demand knowledge I lack. I also tried blockdevice, and that 
*really* got me into a jungle of jargon.

	I'm wondering whether *any* file on an old machine could be so big 
as a terabyte, let alone two. If not, what if anything is df -h telling 
me about this machine as compared to my others? Anything about speed or 
storage?

	I also have a still broader question. Instead of keeping each 
machine, as heretofore, as nearly in sync with the others, actually as 
close a copy of the others, might it be reasonably safe to keep one for 
constant use and the others as supporting specialists of some sort.

	Advice? Comments?
	
-- 
Beartooth Staffwright, Not Quite Clueless Linux Power User
I have precious (very precious) little idea where up is.
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