Same as one can never have enough memory, one can also never have enough disk space. Luckily, on virtual machines that’s easier to resolve than with physical hardware. But increasing the disk space available for a VirtualBox machine is still a multi-step process.
Every once in a while hardware needs to be replaced. Sometimes boards, sometimes CPUs and sometimes drives. Drives are the ones most difficult to replace as they hold all that precious data one does not want to lose.
I personally hate reinstalling stuff; so I try as much as possible to “migrate” my data around. In this tutorial I’ll be replacing two drives under a RAID1 array with two newer bigger drives (and resize the array accordingly).