@JeffSchwenk The problem is most backup solutions are 'agentless'. The advantage of not using an agent is you don't need to reboot the server after installation which is a minor inconvenience. The downside is, an agentless backup (like backup exec), needs to traverse the entire tree of files on the server to figure out what's new, what's changed etc in order to do an incremental. If you've ever booted a computer with something like Sugarsync, you'll notice it crawls for quite a while during that process and unless a server is all SSD, it too will suffer noticeable performance hits as the backup program figures out what changed.
Thus if your client decides to backup every hour or two, for 10 to 30 minutes that machine could be very sluggish during the backup. And this assumes they are using backup software that can reliably back up in use files like MAS on provideX.
Even software that can back up files that are 'in use' can still cause corruptions with MAS because unless you are on SQL, MAS is just a bunch of files. If somebody was committing a transaction where one file got backed up seconds or minutes before others and a posting routine, or a data import occurred across files, you now have an 'out of sync' mas90 database which isn't going to be fun to figure out what's wrong and they may not even notice the problem for weeks or months when certain reports don't balance or tie out.