Wow, I was just about to buy a Synology this coming week and now I have second thoughts. Now more than ever I'm certain that having only Drobo/Synology is not a good backup solution, but having a backup of the backup is equally important.
1. Never expose it to the internet... Use a VPN if you have to access from outside your network. Most home routers support vpn;s so there is no reason not to
2. You should always have 3 copies of data, 1 working, 1 local back and 1 geo diverse backup (i.e a spideroak, crashplan, or even a friends house) Most people forget the 3rd but what happens if your house burns down?
3. You should have a completely cold backup of important data, this could be a external hard drive that is only plugged in when backups are done, DVD's, Tape Drive, or something else, but what ever it is it should not be accessible to the system with out manual intervention, this will prevent scripts from deleting everything.
We have this problem at our company where the fastest internet our company can possibly get is 20mbps down/4mbps up - and we make ~20GB of backups each day. Absolutely impossible for us to upload all of it to a server offsite overnight.
