Question on Backing up folders on a USB Drive attached to a Router' USB Port
I tried iDrive by mapping the USB drive as a local drive, but the speed was really slow. Tried CarshPlan (free) but it does not have such a functionality too (can back up to network laptop but not a Network folder/drive).
<Edit> I am looking at un-encrypted backup, i.e. the folder structure is exactly copied to the USB Disk, so In case I need to access the data on another computer, I can just plug in the USB disk directly into the computer and access the files.
Any thoughts as to how this can be done?
Update in setup and requirements based on LiquidRetro' comment and my own thoughts after trying a few backup softwares.
1) Primary use is to back up static files (files I am not using) e.g. pictures, old data dumps (almost never updated).
2) Currently I have OneDrive where I sync my backup folder. Once I have completed work on my file/s I move them to the OneDrive sync folder for automatic backup to the cloud.
3) I am looking to do a local backup of this OneDrive folder to a USB HDD that is connected to my Router. This HDD will be 99% of the time read only.
4) I want to do an incremental one way sync (from laptop to Network HDD). I want the files to be backed up in their natural state (i.e. no proprietary format) as I want to be able to directly access them form the USB HDD If needed.
And as always: free software is better.