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how to store data safely

Recently my 1TB external hard drive crashed. Luckily no data is there in it. I have couple of other external hard discs which has valuable 3 TB of data. I do not want to anticipate this kind of crash issue in future. I wonder what would be safer way to store valuable data, videos, audio file etc without paying lot of money for online solutions. Shall i buy one other external hard drive and backup there for safe side. One challenge is when i connect 2 external hard drives to my 4gb RAM windows 7 laptop and tying to copy paste the data it is not copy pasting the data. I have to do small bits and pieces of 3GB of folders one at a time which takes long time. Please advice.
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I have 2 small RAID NAS boxes, live data is on 1 of them and replicated to the other as a backup.
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2 small RAID NAS boxes

what are those items. Where can i purchase them?
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I agree with scriven_j online is cheaper, I do not personally like or recomend online backups.
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Online backup problem i see with putting personal confidential data out there on some server running in some other part of the world. Please advice
My advice stands, I do not use or recommend online backup.
i also would not want my personal data on a server that i have no control of. keep your data safe keep it on your premises.
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Yes, Dave Preston, it's safe till someone breaks in and steals all your disks (including backups) or your house goes up in flames or gets flooded.

Offsite backup is the best way to keep data safe.
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you could also mirror 2 drives -  so each holds an exact copy of the other - in case of failure, you still have one
I have two hard drives  and copy pasting from one external hard drive to other external hard drive seems challenging esp 1TB of data. I  am trying to do part by part even then the windows is crashing on me in the middle.  I heard i cannot copy past more than ram size which is 4 gb. please advice
If you don't want to Clone, or run a RAID, check into SyncBack.
It might take a little time and effort to get it set just like you want, but after that, you can pretty much forget about it.
The Free version will probably do all you need it to.

SyncBack.
http://www.2brightsparks.com/

compare versions:
http://www.2brightsparks.com/syncback/compare.html
I use robocopy, it is a very simple and will do changes only
>>   I heard i cannot copy past more than ram size which is 4 gb.  <<  i often copy / paste 100eds of GB in one stroke...
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