Buying the right Nas server.

I am a startup. And I need to buy a Nas server which will be used for the following purpose.

1. Backup my local server which is like 240gb ssd. Of vm.
2. Used as a central storage by each department that way everyone in the depart can access other people file.
I will appreciate you point me in the right direction.
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What's your budget and how many users?  I've used QNAS as well as SYNOLOGY.  Both should have a product to fit your need as they both covered a wide range of NAS options.  From experience, I've found QNAS to be better than SYNOLOGY for corporate use because SYNOLOGY users had complaints where the iSCSI doesn't automatically reconnect.

Do your research and read about some of the complaints (Amazon) users experience with other brand and you will see why  nothing can compare to QNAP and SYNOLOGY when it comes to NAS IMHO. I have been using both for many years at the office.  Very reliable and no problems here.
damola1Author Commented:
My budget is flexible considering the importance of a backup. Is it wise to have same Nas server as storage for employees of different department.

The backup is the life and soul of the company data.

And yes. Qnap is the way to go.
damola1Author Commented:
User base. We are just starting out and so just about 6.
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I don't know how much budget you have and growth anticipation but have a look.  Let me know if any questions.  For around $500-600 you can get a decent NAS that can support 6 users comfortably like the Pro series (TS-470 Pro)
damola1Author Commented:
Is it possible to do segmentation on a nas server, whereas people can only see what they are allowed to see. Basically, I will like to download and put a lot of training videos for each department employees there.
Yes, you can do that as you will be creating users or groups then applying permissions to what folders/files they have access to as well as read/write/modify permissions, etc.  The QNAP and Synology are Linux base so you will be able to apply file/folder security permissions as you would on a Windows machine.
damola1Author Commented:
My linux developer said: is fine enough. What do you think?
Yes that one is ok if it's sufficient for you.  I gather mirroring is good enough for what you need it for.  All the QNAPs run the same UI for the most part with some has more options than others which obviously come with the price.  I have use different QNAP models and all are reliable and solid so far.  Very easy to deploy and maintain.

Here is a live demo of the UI if you like to get a feel for it (creating users, folder, assigning folders/files permissions, etc.):

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