Sudo SNap refresh nextcloud

Hi all,

I just made a snap refresh on my Nextcloud.

It takes age and I can see my free space being eaten by a copy of all my data.
it is saying Copy snap “nextcloud” data

Is this normal? When doing a update, I guess it is not common to copy the content of the data folder as well? I would need twice the size…

Can someone enlight me on this?

Thank you