I'm running OMV on an Odroid-XU4, with one external hard drive (2TB). For now, there is no backup, and I manually keep copies of my files on other computers. For now, I use ~500GB of space. I use this NAS to store my music, photo/video, project files,...
I would like to add a second USB hard drive (2TB or more) that would store a backup of the first hard drive.
Using rsnapshot, I could do incremental backups and have the possibility to keep multiple version of the files.
Rsnapshot would run daily, and backup, for example, 7 days and 4 weeks of my data.
This solution is very simple, "straight to the point", and quite cheap. But I'm afraid of losing data in case of hardware error, unexpected power down,... That is, some unexpected events that could corrupt the whole filesystem, or "silent corrupt" the files.
I'm wondering how reliable is this strategy? Do you think I should change/improve it?
The first think that comes to my mind would be to connect the backup hard drive on another device than the XU4, on a raspberryPi or my OpenWRT router, for example. This way, if the XU4 fails and corrupt the filesystem, it wouldn't corrupt also the backup hard drive.
Any thoughts about this?