Can't find this anywhere thus far? LVS column meanings?

Some of them are obvious. LSize, VG, LV and a few others. I can't seem to find anything on the rest, or I just don't know what to search for?

Code:sudo lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
root main -wi-ao---- 25.00g
swap main -wi-ao---- 2.00g
vm main owi-aos--- 300.00g
vmsnap main swi-a-s--- 10.00g vm 0.28
backups seagate2tb -wi-ao---- 500.00gI'm running my Windows in a vm again with a passed through gpu. Working great. Decided to do snapshots to backup the vm on a script. I'm just wondering if my snap size is enough. I'm not sure what that Data column means. I'm assuming it's percentage of the volume used? 1/4 of a percent thus far?

I'm just not getting that I guess. Not obvious to me at least.

Script for reference

Code:#!/bin/sh
# tadaen sylvermane | jason gibson
# lvm snapshot auto backup

if lvs | grep "$1" ; then
[ -d /mnt/vmsnapshot"$2" ] || mkdir -p /mnt/vmsnapshot"$2"
lvcreate -s -n "$1"snap -L 10g main/"$1"
wait
mount /dev/mapper/main-"$1"snap /mnt/vmsnapshot"$2"
rsync -auv --progress /mnt/vmsnapshot"$2"/* /mnt/vmbackups"$2"/
wait
umount /mnt/vmsnapshot"$2"
lvremove --yes main/"$1"snap
fi