Match tag exactly for deletion by only checking what's between the periods.

bin/backup.sh

@@ -60,7 +60,7 @@ chown -Rv root:root "$BACKUP_DIR"
 # Remove the last backup.
 echo "`date` - Removing existing files."
 cd "$BACKUP_DIR"
-mv -v "$BASENAME"*"$TAG"* TRASH/
+mv -v "$BASENAME."*".$TAG."* TRASH/
 rm -v TRASH/*
 
 if [[ "$down" == "TRUE" ]]; then