Just to let everyone know, I have this site on a 7 day nightly backup. What this means is that I keep a new copy each night of the database and web pages for 7 days. After the 7th day the oldest copy will be overwriten with a new copy. In the event of DB failure it will not overwrite with broken data. So I guess what I'm saying is that your data is safe here.
I'm backing up to 4mm DAT in addition to being on another server. I can't afford DLT or I would use it. The DAT is not too bad, never had it not read back data. I guess I could also backup to CDR or CDRW. Not sure that's needed.