Heavy file .quota.user

The SSD of our Mac mini Server is quite full. As all the sharing points are on our 2 Drobos, it's very strange.

Using the terminal, I found a very heavy invisible file named .quota.user

-rw-rw-r-- 1 root admin 18436 10 aoû 13:33 .DS_Store

d--x--x--x 8 root wheel 272 10 aoû 09:56 .DocumentRevisions-V100

-rw-r--r-- 1 root wheel 2560 6 nov 2016 .OSInstallerMessages

drwxr-xr-x@ 2 root wheel 68 10 aoû 13:02 .PKInstallSandboxManager-SystemSoftware

drwx------ 9 root wheel 306 10 aoû 13:13 .ServerBackups

drwx------ 5 root staff 170 19 déc 2015 .Spotlight-V100

d-wx-wx-wt 3 root wheel 102 26 jui 16:41 .TemporaryItems

d-wx-wx-wt 2 root wheel 68 26 jui 17:16 .Trashes

-rwxrwxrwx 1 root admin 28 31 jul 2011 .error

---------- 1 root admin 0 21 fév 04:38 .file

drwx------ 341 root wheel 11594 10 aoû 13:32 .fseventsd

drwxr-xr-x 3 root admin 102 25 jul 2011 .gem

-rw-r--r--@ 1 root wheel 0 20 déc 2015 .quota.ops.user

-rw-r-----@ 1 root admin 4194368 10 aoû 13:36 .quota.user

drwxr-xr-x@ 2 root wheel 68 6 nov 2016 .vol

Could I delete this file ???

Thanks for your help.

Jacques