A RAID (even a mirror like RAID1) is NOT a backup! Please don't make the mistake of treating it like one. If you accidentally delete a file it will delete on both. If you destroy the partition or anything else it will mirror it to both drives. If a file gets corrupted it will corrupt both copies when it mirrors it. RAIDs of any type are NOT a backup.
Try out one of the online backup services or simply buy a couple large hard drives and use a program like "create synchronicity" (open source I believe). CS will "mirror" your files (and create new copies of modified files instead of writing over your backup) or it can do simple backups or many other neat tricks.
Also, Dropbox is not a backup either. It's a file sync service. Be careful using it as a backup (even Dropbox says this. It's possible to damage the file on one system and then sync the damaged file everywhere else for example).
For local backup, I currently have a desktop computer with a RAID1 disk system. It's one of my XP machines so when I get the Win 7 desktop that is going to replace it I will dedicate that computer to local backup. I really should set up a cloud backup system so I have something off site though...
The RAID system has already proven itself. when one of the disks crashed, I was able to copy the data off the good drive (just to be safe), then take it to the local computer guy who installed a new drive and got it synced up for me.
Max, it seems that great minds think alike. I'm not leaving Dropbox either, but found that having Copy.com to back up stuff that I don't want in DB gives me added peace of mind since it provides so much more space than DB. https://copy.com?r=t3Jz1w
I was confused- I have Microsoft's "Skydrive" on my machines, although not used much. I was puzzled by "Onedrive". It appears that Microsoft agreed to change the name at the insistence of bSkyb (from the UK), but have also improved the service as detailed in this article "OneDrive vs SkyDrive"
the onedrive.com is a Microsoft alternative, but it is a very nicely done solution. Maybe it does not have 100% of all the features the other platforms have, but the core ones are there. Plus you have free online Office tools to edit your files in MS office or OpenDocument formats.
As far as I understand they support onedrive on all majour PC, tablet and phone platforms and even xbox. You get for free 7GB, but some of us got 25GB for free permanently due to a promotion for the early adopters.
Also through onedrive.com you can access all files on your other registered PCs (no need to configure routers or firewalls) if they are on.
I think now Windows 8.1 also backs up and sinchronizes some Windows preferences using onedrive.
I did my self IE favorits sychronizing on all of my PCs through onedrive.
Now there is also some kind of documens version history support, but I have not tried that yet.
DropBox seems to be a good option for backup. I lost lots of data because I copied in external harddisk and when I moved dont know what happened to hard disk it doesnt come up. Had I copied in DropBox iI still would have that precious data. How about security. Will it get copied and used by anyone.