Shared server, so unable to manage the "execution time." Snapshot issue.

Hello all! Desperately trying to use "SNAPSHOT," to back up one site, before migrating, and using it on other sites. The error message comes back that it needs a minimum of 150secs of execution time in the host settings, but alas I'm using a shared server (with Hostgator business plan) so cannot manage, or get those settings changed as it would be a "global," setting on the server?! Is there any work around for this, or does this mean I can't use Snapshot on ANY of my sites with Hostgator (or any shared service plan?) Your help in this is extremely appreciated. Sincerely Jezz Grainger (Novordium Ltd)