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Script that adds another route to internet. Add table "admin" to /etc/iproute2/rt_tables once before running the script the first time. Here, 10.0.0.138 is the router, eth0 is the network device that connects to the secondary route.
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#!/bin/bash
#Add table "admin" to /etc/iproute2/rt_tables
myotherdevice=eth0
myothernetwork=10.0.0
myothergateway=10.0.0.138
myotherip=$(ifconfig | grep $myothernetwork | cut -d: -f2 | cut -f1 -d' ')
ip route add ${myothernetwork}.0/24 dev $myotherdevice src $myotherip table admin
ip route add default via $myothergateway dev $myotherdevice table admin
ip rule add from ${myotherip}/32 table admin
ip rule add to ${myotherip}/32 table admin
ip route flush cache


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Script that downloads a directory using rsync, with resume.
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#!/bin/bash
while [ 1 ]
do
    rsync -avrvv --size-only --partial --progress username@host:/source_dir destination_dir
    if [ "$?" = "0" ] ; then
        echo "Rsync completed normally."
        exit
    else
        echo "Rsync failed. Retrying in 3 minutes."
        sleep 180
    fi
done

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Same, but binds the connection to the other interface/route (10.0.0.2 is the assigned ip).
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#!/bin/bash

while [ 1 ]
do
    rsync --address=10.0.0.2 -avrvv --size-only --partial --progress -e 'ssh -oBindAddress=10.0.0.2' username@host:/source_dir destination_dir
    if [ "$?" = "0" ] ; then
        echo "Rsync completed normally."
        exit
    else
        echo "Rsync failed. Retrying in 3 minutes."
        sleep 180
    fi
done