Error when restoring site with Snapshots

I'm trying to migrate a site using Snapshots. I did upload my recently created backup to the Snapshots folder and import it.
Then, when trying to restore it I got the following error:
"The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later."

I did try later and nothing.
I'm using a dedicated server that I have full control so I ad some super extra memory limit to everything and nothing, I still have the same error.
My server is working fine according with system status and I monitoring graph are just normal.
Please help me I really would like to switch to Snapshots and get ride of Backupbuddy :wink: