Alright let's take this one step at a time:
If your backup folder is 93GBs, then it sounds as if you have as many as 30 or more AmazingCharts.enc. files inside. If that is the case, then delete all but four or so. You can get 3rd party programs which will delete the last file of whatever amount.
You can set a path to back up the Amazing Charts backup to another destination like your external hard drive, but you will still need to empty your backup folder. I doubt you have a 93GB file or even one that is close.
Yes, there is a good reason to back up online. Personally, I would use a different one. There are a few you can "seed" by sending the the initial full backup on a hard drive. They will even send the data back that way over night if you need to restore quickly. I would also look for one that can use VSS to back up SQL. These backup programs sometimes charge by the space, bandwidth or amount backed up daily. So, you may not need to pay a lot for space. Some are limitless.
So, a good backup strategy is to back up onsite, online and offsite. I would also highly recommend you back up to more than one external hard drive. HDDs are the weakest link in a computer system. You really don't want all of your backups on one place.
So, for offsite, you can back up daily, three times per week, or weekly. Depends on how much data you can afford to lose. If you take it home on Tuesday and Friday, then you can only lose up to three days of work.
But, #1, check your AC folder and open the backup folder. See how many files are there. You can also use the Amazing Utilities and Advances and delete them, but I find that is a waste of time.
