[SorcererStone]

I don't know if this subgroup is the correct group for my question. If not, can someone let me know.
I have 4.3TB data and on average, I have about 200MB new data piling in. I have a RAID 5 NAS locally for backup.
I am fully aware the 3-2-1 rule. I don't understand the "2" - different formats requirement. Want opinion from the forum so that I can write a proposal.

E.g. from this URL, https://www.veeam.com/blog/how-to-follow-the-3-2-1-backup-rule-with-veeam-backup-replication.html


it said store data in 2 different formats. That does not make sense to me in this day and age. I have huge amount of data. It is ridiculous to store the backup data on CD/DVD, tape other than RAID format NAS. Also, doing this burning to discs and tapes create a huge unsolvable data management and access problem (plus liability issues as well). Hard dive solution is the digital data management solution viable. Am I correct?

Doing this 2 media formats on cd/dvd/tape will create a tons of problems on their own and make people stealing data more easier as well. Do you buy this thought?

So should the proper data storage is 2-2-1: i.e. one local (in NAS) and one offsite (another NAS) or in third party's cloud to safeguard DR.

Thanks in advance.

 

[SpywareDr]

Strategy: Disk Backup for Speed, Tape Backup to Save Your Bacon, Just Ask Google - High Scalability -

Tape versus disk: The backup war exposed | Computerworld

Backup For Servers – Disk or Tape Backup. Which is best?

 

[GentleArrow]

You wouldn't store data long term on a USB stick due to if the battery dies you lost everything.
You wouldn't store raided drives in a safe unless you could assure you could put the drives back in the raid array in their original order and whatever controller, if not original, supports them.
Coping data like what you are doing with the RAID is not the same as running a backup to tape or other media since backup compresses the data as well as allowing for encryption which is a requirement if storing off site.
You can do tape libraries which allow for the storage of petabytes of data.

Each media type has its own advantage. You need to figure out what works best for you.

 

[Fred Garvin]

I wouldn't read too much into that 3-2-1 rule as far as the media. Use what works for you. I'm more concerned with a corrupt backup not completely restoring. I often do:

-An on-site backup to hard drive.
-An off-site backup to hard drive
-online backup for data only.

Local & off-site backups are for system images and user data, in case of a hard drive crash.
Online backups are for user data recovery only. E.G., a catastrophic event like a building disaster where the computers are destroyed. That's a last resort. you don't want to be waiting to recover 4TB of data over an internet connection!