Depending on the size of your data corpus a few USB disks w/ full disk encryption could be a cheap insurance policy. Use a rotating pool of disks and make sure

Depending on the size of your data corpus a few USB disks w/ full disk encryption could be a cheap insurance policy. Use a rotating pool of disks and make sure only one set is connected at once. Force the attacker to restore to kinetic means to completely wipe out your data.