For a number of years, I have used Crashplan as my offsite backup. I found the price and features attractive. It also worked on Linux which further won me over since I was running a Linux server as my file server. Their unlimited plan for a single machine was very affordable especially when purchasing multiple years. $3-4 per month for unlimited backup was well worth the price to have peace of mind in case something bad happens at home (I actually did need to use it one time when I had a failing hard drive corrupt several of my files).