I logged into my office and did a test offsite backup - if you go into advanced options and set it to send confirmation it will advise you that it did the backup and give you times, etc. This does not guarantee you have a copy which 100% works, but you certainly could contact Guardian Angel and verify it.
It does tell you the size, when done, etc. You also can set it to save a copy to a flash drive, NAS, etc.
