CrashPlan is excellent. You can get a "family plan" for ~$12 a month, backup as many files you want on a bunch of computers. No file space limit, no bandwidth t

CrashPlan is excellent. You can get a "family plan" for ~$12 a month, backup as many files you want on a bunch of computers. No file space limit, no bandwidth throttling. Online access to files, including from native mobile apps.