Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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Here is the issue with modularity like you are planning. If a cable is loose because something bumped into it you now have a problem to chase. Even worse you now have the potential for a power cable to become completely unplugged while the host is still up and running. Having two power supplies also creates a potential for a ground loop through the data cables if things are not made correctly.
Some people have been able to use USB drives connected to a computer to create a NAS but they are also the ones hitting forums because they have issues. What you are trying to do isn't much different. If you want to keep your hardware you would be much better off getting a case that can hold all your drives. A used server chassis would be ideal if you use a SAS card. But if you are going to upgrade anyway maybe it's a time to make plans to make the switch sooner than later.
Do some commercial solutions for this exist that are safe, yes they also live in racks and are effectively ground connected with the cabling protected/much less likely to be bumped into.
so you basicly also recommend getting a proper case and psu to fit everything into one machine?
Yes.
It eliminates risks.
For example I have a proper NAS, a server with one large drive, and 2 external drives.
Guess what I never have a problem with? The NAS or the internal drives. Occasionally one of the external drives will just disappear from the server, because they're not really intended to be up 24/7. So I'll have to power cycle it.
Also those external drives don't have any active cooling - they weren't designed for that use case. So I've found they tend to get warm if I'm copying anything to them, and now have an old case fan on them. Talk about janky.