Hi Support, below the answer from Akeeba Support team.
I'm Davide from Akeeba Ltd. After the customer pointed out that some data was missing from his restored website, I decided to run some tests. First of all, I took a full backup of the original, working website.
I restored it locally on my machine and indeed in the homepage there was some missing data.
To be sure that everything was included in the backup, I uploaded a single file database manager tool (adminer) and exported the whole contents of the table #_sppagebuilder . In my local machine, I copied the new data using the command line, using the native mysql command. I opted to cut out any third party tool to exclude any data manipulation.
After inserting the data locally, the homepage is still missing some data.
At this point, I can exclude that Akeeba Backup is not including some information from the database.
SP Page Build team should review customer website to understand why their extension is not displaying the same layout even if the data is the same.