I believe if you go to advanced options on Amazing Charts Backup you can choose send confirmation to a USER. This will generate an e-mail in your AC inbox that tells you if it is working - I am out of the office - you could try using AC Backup with only offsite and see what the e-mail says. You can set this to do daily and an e-mail will always be in your inbox in the morning.
I don't use offsite under AC, but it does advise me of the other places I have it set for. Give it a try and see if that gives you the information you are looking for.
