So, when picking a NAS, it is important to get some reputable, NAS-focus company and brand. There are so many brands now selling NAS, even those used to be just in the wifi arena.
Large industry storage solutions are based on RAID5 and the swapping of single disks is a standard activity, even without taking the storage offline. Best to leave the RAID management to the storage. Plenty of offerings in the market.
Apologies for side-tracking but which portable HD brand is more "reliable" between...
Or... put it another way, which one "should I avoid"
Though cooling plays a major part, most of these corruptions I have seen are due to zero parking error, head misalignment, scratched platters due to head crash (Some of these can be attributed due to temperature but majority of them are due to drops and knocks). Ever heard of a weak air filter which let dust particles in and scratched those platters
Should external harddisk only be used as a backup device i.e. plug in PC and backup your files once in a while?
If I use one as an active harddisk plug permanently to my PC and access/edit my photos/video through it directly, will it fail even faster?
What bugged me also were the recommendations about environmental conditions. I try to monitor my disks with smartmontools, the reading shows the temperature of the internal sensor. But in most documentations one can only find the air temperature, mostly without consideration of a cooling fan and the resulting cooling by airflow. Even a question to IBM support was fruitless, I only got standard template answers.
Backup and Redundancy setup are 2 separate stuff.
If you want to archive your picture,
then Backup is the more idea solution.
Redundancy is more appropriate when Turnaround time is critical.
No matter how great your setup is,
if your PC got cart away, everything's gone
With portable backup, you can have 1 copy at home, in office etc.