Migrating your local piwigo application On Gertie in any temp dir:

cd /Work/www/piwigo
tar -cvjf /MyStuff/Piwigo/piwigo.tar.bz2 ./*
cd /MyStuff/Piwigo
ls -la piwigo.tar.bz2
split -b 450M piwigo.tar.bz2 "piwigo.tar.bz2.part"

Ftp individual parts to a work dir on your domain server..Filezilla works well.

On domain server file manager (HostGator C-Panel) open a terminal, locate tar parts, and recombine with:

cat piwigo.tar.bz2.parta* >piwigo.bz2

Back in a file manager, extract piwigo.bz2 to public_html.

How to Split Large ‘tar’ Archive into Multiple Files of Certain Size