Disk space on clean install jumped from 12gb to 49 used?

[cRuNcHiE]

I have a new MacBook Pro, once it had done a clean install of High Sierra I notice it was using 12GB of disk space.
All I have done since is download my icloud photo library to an external SSD but now the disk used has jumped to 49GB?

Any ideas where this disk space has suddenly gone? is Photos storing some cache on internal SSD somewhere? I literally haven't installed anything else yet.

~/Library/Caches only contains 450MB

 

[Weaselboy]

Do you have Time Machine turned on? If so, the first two posts in this thread may help you.

 

[cRuNcHiE]

Do you have Time Machine turned on? If so, the first two posts in this thread may help you.

Hi, thanks but no I don't have it turned on yet.

I ran "
sudo tmutil listlocalsnapshots /" anyway and it didn't return any results.

I did try and migrate an account over from another Mac ( which failed as it kept stalling).
I deleted The account that it added to the new Mac after that failed attempt though.No new apps were installed.

The trash bin is empty.

I just installed Disk Drill. The numbers don't add up!
The cache from photos after downloading my library is about 5GB so that takes it unto around 19GB but Disk utility says 43.5 GB used.
[doublepost=1514587612][/doublepost]I have found the hidden data! Basically despite Users&groups only showing my current login, there is a leftover folder from the failed migration in /Users/Username
This folder is only reported to be 16KB on my sole Administrator account but it won't let me into the Desktop folder inside it to see contents.
Using DaisyDisk it reports it to be a hidden folder and tells me that actually it contains 25GB of Data!