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New to Linux - how to tell if a partition is formated?

Have installed 1.8TB of space on Ubuntu 20.4.2 server.  I show 1 logical drive sda with three partitions; sda1, sda2 and sda3.  I would like to store immutable backups on sda3, however, when I point our backup software (Veeam) to the server partition /dev/sda3/ it populates a value of 15.6GB.  I don't understand where it is getting this and thought maybe the partition isn't formatted and returning bad data.

Disk /dev/sda: 1.65 TiB, 1800303042560 bytes, 3516216880 sectors
Disk model: LOGICAL VOLUME  
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 262144 bytes / 524288 bytes
Disklabel type: gpt
Disk identifier: 46EA827F-2082-4037-8C13-F229AF0F6A64

Device       Start        End    Sectors  Size Type
/dev/sda1     2048       4095       2048    1M BIOS boot
/dev/sda2     4096    2101247    2097152    1G Linux filesystem
/dev/sda3  2101248 3516213247 3514112000  1.7T Linux filesystem

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Seth Simmons

8/22/2022 - Mon