video surveillance archiving

I am looking for video surveillance management & video storage/archiving advice.  I am replacing 19 very old video surveillance DVRs (4 analog cameras each) with encoders so that I can centralize the recording and archiving of the video for insurance needs.  We are looking to keep the videos for up to a year.
I have reviewed video management systems like Milestone and Onssi as well as the server/NVR storage options.  But am unsure if I they are my only options.

The storage requirements appear to be over 120 Terabytes.  
Are heavy duty storage devices my only option?
peacefulwarfareAsked:
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ZamZ0Connect With a Mentor Commented:
We use Bosch DiBos. Excellent tech support when (rarely) needed.
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peacefulwarfareAuthor Commented:
Bosch Security seems good.  Like their DIVAR IP systems. Almost plug and play.  Thanks for the input.
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SHBStorage Network SpecialistCommented:
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