I wasn't sure of the details (available ISP bandwidth, file sizes, ....). But I'm not sure by what you really plan to do with the tape either.
I ask, as keeping the tapes locally can protect you somewhat, but not from everything (i.e. your data would be safe if the office burnt down, but not if there was a flood that takes out both the house and office). Hopefully you get where I'm going with this...
- Do you mean to do it all yourself (i.e. keep a set of tapes stored at home, and the system in the office sort of situation)?
- Or do you plan on using a proper tape storage company (i.e. use couriers to ship your tapes to say a mountain storage facility)?
Will buy a LTO-5 drive myself and do all my backing up manually. Probably keep a stash of tapes in my safety deposit box or other trusted location...maybe Cheyenne Mountain.