A NAS (Network Attached Storage) box is simply a housing for a number of drives. Once inserted you can create a RAID array. You get to choose between.
1. Striping, which scatters your data across both drives but if one drive fails you lose all your data, on the plus side it is faster access.
2. Mirroring, with this method you add two identical size drives and what you copy to one is mirrored to the other automatically that way if one drive fails the other still contains your data. Slow read/write but much more secure.
3. JBOD, (believe it or not) just a bunch of disks files will be written to a single drive and once this drive is full it will spill over to the second but you see it as a single drive letter in Windows Explorer. This way if you lose a drive you only lose what was on the one drive unlike striping where you lose all data if one drive fails.

Mirroring is definitely the way to go with such precious items as photographs as they can never be replaced.

You attach it to your home network and run software on you PC that will find it an then set it up how you want it.

Here are some examples
link
I have an LG NAS drive to store my pictures and it is configured with a mirrored set of 500GB drives I.e. two 500GB drives. Even though there are two I only see 500GB of space in Windows Explorer. This configuration really does give you peace of mind.

Ah sorry, didn't notice your location. Any good computer store should know what I am talking about. Good Luck.

Point taken, but will it shorten the range of the lens? Which is pretty much what I meant.

Stay ... it was there, you should tone the sky down a little though.

There is photography and there is photo manipulation ... but that has always been the case. Just enjoy and share for the rest of us to enjoy as well.

Try removing the physical disk from its case and attach it directly to a spare IDE/sata port on your PC. If you still can't access the data it will be a problem with the HDD but this is usually the controller board on the back of the HDD and rarely the platters.
Almost all data is recoverable even if your HDD appears to be dead. I would advise in future that you use an external NAS drive with two large disks and always configure them mirrored. That way if a disk dies the other still contains all your data.
If you cannot get your data back give me a shout

Spot is great but sometimes you need to focus on something that is not central to your viewfinder so on these occasions its wise to use sel and chose the point that you want to be the point of focus and either position your subject there or wait for it to arrive, if a moving target.

How about using the 13mm form a set of macro tubes, I know it will shorten your focal length but it means you can use the lens.

It arrived this morning so had a little play with a fossil. Concave on left...




First two with the Sigma 105 macro.
Second two with reversed 50mm on the tubes with the 49mm bayonet adapter.
Let me know your thoughts.

Concave with Sigma 105 macro




Convex with Sigma 105 macro




Concave with 50mm



Convex with 50mm

Loads of very helpful people here on the forum, don't be afraid to ask for help, regardless of how trivial. Welcome to Pentax, you've made a good choice.