Re: Can someone please explain to a non techy bod like me
In this case it's probably a catchall term used to obfuscate what really happened.
However, server maintenance could be patching software or it could be upgrading hardware. I would hope that they replace disks on an ongoing basis as they fail.
Data centre maintenance could involve all sorts of things including servicing of the plant (ie the power and cooling infrastructure).
At the more extreme end I've seen relocating an entire data centre described as maintenance