A redundancy of 2 to 3 in storage means that data is stored in such a way that there are at least two copies of it, and up to three copies in total. This means that if one copy of the data becomes corrupted or lost, there are still two other copies that can be used to recover the original data.
Redundancy is a common technique used in data storage to ensure data integrity and reliability. By having multiple copies of the same data, it is less likely that the data will be lost or corrupted due to a hardware failure or other error. In the case of a redundancy of 2 to 3, the minimum number of copies is two, but there can be up to three copies in total.
In some cases, a redundancy of 2 to 3 may be used as part of a larger data storage system that uses other forms of redundancy as well. For example, a system might use a combination of disk mirroring, RAID, and other technologies to ensure that data is stored in multiple locations and in multiple formats, providing multiple levels of protection against data loss.