Again, here’s a surprisingly cheap Office 365 backup answer. Some may query if you want to back up Office 365 at all. You could set up limitless retention towards all content material, so why take a backup?To me it’s a definite grey area, and partly depends how much you value the information. Microsoft may never lose your data, but will it be accessible 100% of the time?What if that important doc is to your OneDrive and hadn’t synced down, and there has been an outage?We’ve seen a few outages lately, including ones that have broken authentication – your data remains to be there, but one could’t get to it.
In that state of affairs, having a local copy of anything time delicate may be worth it. Considering the relative budget friendly of buying a Synolgoy DiskStation – your disks are doubtless going to price more than the unit itself, I agree with it a beautiful easy sell.