Okay. So you reckon for my needs, a 2 or 4 bays NAS should be sufficient? Not require to go for SMB type NAS?
I will have to work out how much for two smaller NAS locally if want a second one as backup NAS. I assume that if the NAS having issues, we can just put the current HDDs onto another NAS and it will work? Or still require configurations if not the same NAS just same bays?
A lot of time the local staffs have no knowledge how to properly maintains it so most of the hosted service always at HQ.
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Please re-read post 4 at the least or the entire thread, ideally. I think you're somehow misunderstanding what I've been stating.
For a 'central' NAS setup as you originally suggested, I stated that you need
at least a 2x 6-Bay NAS (I would opt for 2x 8-Bay NAS' though for optimum set up flexibility and redundancy). These will be after all responsible for fully servicing the entire organization. Having a single NAS in this role is asking for trouble from the get-go. And merely having the data safe (on the server) is not good enough. You need a setup and ready to go NAS that can replace one that may critically fail at anytime for many possible reasons, including something simple like a LAN port going on it.
With an 8-Bay NAS, I would install the 2 HDD's in RAID1 and install the QNAP operating system on them (no other HDD's would be installed at this time, during this part of the setup).
With the remaining six bays, I would create two 3x RAID5 arrays which will backup and provide the versioning capacity you want on a daily basis. The sheer number of drives will make the system as fast as needed for the smaller file sizes, even over the WAN and even the larger ones for local access (not over the WAN, but that could change depending on your ISP speeds in the future).
These 2x 8-Bay NAS' then would be mirrored to each other on a rotating basis (not continually) with a daily, weekly, monthly or other custom schedule depending on how quickly and transparently you would need them to be switched if one or the other develops a critical failure.
For a setup that includes a NAS in each location/site, I would be buying a 2-Bay NAS that is in RAID1 at each location and is being constantly (background process) being updated and mirrored to all other NAS' from the other sites.
The 2x NAS solution is in the $4 to $5K range at the minimum for the quality (dependability and reliability) and the larger number of expected users connected. The 6x or 7x NAS, 2-Bay solution should be the same or possibly even less, even with a 7th or 8th NAS unit (mostly) pre-configured and ready to go as a replacement, if/when needed, to any particular site.
I really don't see your original $1.5K budget meeting your actual requirements in any meaningful way.
With about $5K real dollars to play with, your options and possibilities with a true cloud service are much more open.
The lifetime offer from pCloud or others (and if available for companies) is a very strong option too. One more thing to look into which will be much more robust than anything we can possibly build and support for less than $10K on an ongoing/indefinite basis.
If pCloud offers lifetime packages for companies, that would probably be my first choice, depending on the cost (remember, you only need one account and you can install it on many computers).
Otherwise, the NAS units at each location would be my slightly preferred long term choice right now, with the information so far (mostly because a failure would not affect the whole organization all at once).