How do I fix this snapshot issue?

Hi there, when running snapshot, i get this error:
Fatal error: Out of memory (allocated 47972352) (tried to allocate 35 bytes) in /homepages/3/d281076218/htdocs/fstop8/wp-content/plugins/snapshot/lib/snapshot_utilities.php on line 420

How do I fix that? And does Snapshot backup my database and my files? thanks and take care.