USB Hub and HD Configuration for backup
Posted on 2015-02-17
I'm trying to get a particular backup set up to work. This is in addition to 1) a local, always connected USB HD backup, 2) a remote offsite backup, and 3) an occasional physical offsite USB HD. (Even the paranoid, etc.)
The goal of this *fourth* backup scheme is to have a daily rotation of a *disconnected* local backup. The current approach is this:
> 3 USB portable HD's, each attached to a different switched port of a USB Hub,
> 3 incremental backup jobs, each aimed at one of the drive letters
> the backup jobs would run every three days (except one, which would run two days in a row, because my backup SW is not that smart, and that's an acceptable "risk")
> Each morning I would use the Hub switches to activate the HD that would "looked for" by the backup job that was going to run on that day, and to deactivate the other drives.
Currently, for the USB HD's, I have two WD2500ME's (WD 250 GB) and a WDBPGC5000ATT (WD Passport Ultra 500GB). For the Hub I've currently got a Sabrient HB-UM43 (4 port, switched, unpowered). The PC is a Dell XPS 8500.
The Hub is USB 3.0, the PC port is USB 3.0. The 250GB's are USB 2.0, and the 500GB is USB 3.0. The Hub is connected to the PC through its own 12" cable and a 6 foot USB 3.0 Extender.
The problem I'm running into is that when I "switch on" the 500GB, at the Hub, the PC recognizes it, after a couple of minutes. But when I switch on the 250GB's the PC never recognizes them. If the 250's are connected directly to the extender cable they work fine.
So, this could have several causes, and there might be several solutions.
I think the main cause must be that the 250GB's require more power than the 500GB, and that the link through the Hub cuts the power just enough that they don't hook up properly to the PC.
So, I could either get two more 500GB passports, or get a powered hub. I'm tempted to get the passports, because I could use the 250's for the physical offsite backups, and they've served their time in any case.
So my "ask" here is four part:
a) is there anything about this scheme that just "won't work", that I may not be considering?
b) is there some other reason the 250GB's might not be working through the Hub?
c) is a powered hub likely to help? (i.e. worth a try?)
d) what is a good quality powered 3.0 USB hub that has individually switched ports?
Any help with this would be appreciated.