You get as much offsite storage space for your backups as you set aside to store other Symform customer's data on your network. Using RAID 96 (most servers use only RAID 5 to spread redundant data around to protect against hardware failure), each gigabyte of data you send to Symform is encrypted then spread across 96 other Symform customers in small, non-identifiable data blocks. It would take years to break the 256bit data encryption after someone gathered 64 copies of each of your data blocks from across the Symform user base, so even paranoids should feel secure. They won't, but they should.
Sold via resellers who help you set up the sharing space and other configuration details, Symform has a street price of plus or minus $50 per month. There are no extra charges for the amount of data, so that price stays level no matter how much you backup. The only “cost” is making that same amount of space available on your own system to be part of the offsite data storage sharing environment. Don't you feel green?
I won't nag you about backup again, so please pay attention this time. With the wealth of local and offsite backup storage options, including these three and hundreds more, you have no excuse not to backup your data. Remember, when you lose data, you lose dollars. Keep both safe, please.