3-2-1 Backup Rule
The 3-2-1 backup rule recommends three copies of data, on two different storage media types, with one copy kept off-site.
View definitionIT Dictionary
Clear, practical definitions to understand network, security, systems and IT vocabulary.
Filter by topic 63 topics
All topics
3CX 3
Active Directory 26
AI & Data 19
Applications & API 3
Backup 52
Backup & Security 10
Cloud 22
Cloud & DevOps 21
Cloud & Linux 23
Cybersecurity 93
DNS 3
Email 17
FortiGate 40
Hardware 21
IA & Data 3
Identity & API 2
Identity & Directory 15
Identity & SaaS 1
IT & Operations 7
Linux 70
Microsoft 365 84
Monitoring 2
Monitoring & ITSM 21
Networking 101
Networking & Datacenter 1
Networking & DNS 11
Networking & Ethernet 1
Networking & IPv6 4
Networking & Monitoring 1
Networking & Multicast 1
Networking & Routing 4
Networking & Security 4
Networking & Switching 4
Networking & VLAN 2
Networking & Wi-Fi 8
Networking / VPN 1
PKI & Certificates 7
Security 16
Servers 39
SSL / PKI 5
Storage 37
Storage & Authentication 1
Storage & Linux 1
Storage & Virtualization 2
Telephony 10
Telephony & VoIP 18
Virtualization 59
Virtualization & Storage 10
VMware 2
VPN & IPsec 2
Web 6
Web & Data 31
Web & Development 8
Web & Networking 3
Web & Security 2
Web & WordPress 16
Windows 46
Windows & Hardware 1
Windows & Identity 1
Windows & Security 2
Windows & Storage 2
Windows Server 5
WordPress 14
52matching definitions · 1,058 in the dictionary
Clear filters
3-2-1-1-0 Backup Rule
an extension of the 3-2-1 rule recommending three copies, two media types, one offsite copy, one offline/immutable copy, and zero verified errors
View definitionAir gap
A strong separation between a backup copy and the production system.
View definitionApplication Item Restore
Application-item restore recovers selected objects such as individual emails or database records rather than an entire backup.
View definitionApplication-Aware Processing
backup processing that coordinates the snapshot with the application to obtain a transactionally consistent state
View definitionApplication-Consistent Backup
An application-consistent backup coordinates application writes so restored databases and services can recover in a valid state.
View definitionBackup
A backup is an independently retained copy of data or systems that supports recovery after hardware failure, deletion, corruption or attack.
View definitionBackup Catalog
a central index describing available backups, their contents, restore points, and locations
View definitionBackup Chain
the ordered set of full and incremental/differential backups required to reconstruct a restore point
View definitionBackup Copy
Backup Copy is a concept or mechanism used to backup to copy restoration points to a second independent location.
View definitionBackup Gateway
A backup gateway transfers backup data between protected workloads and a repository or object storage endpoint.
View definitionBackup Health Check
a periodic check that rereads or recalculates backup data to detect corruption or inconsistencies before restore time
View definitionBackup Immutability
Immutable backups prevent stored restore points from being changed or deleted during a defined protection period.
View definitionBackup Job
a configured backup-software task that defines what to protect, when, where, and under which policy
View definitionBackup Metadata
the descriptive information of a backup: inventory, index, dates, objects, dependencies, checksums, or restore settings
View definitionBackup Retention
The duration or number of backup points retained.
View definitionBackup Set
a coherent collection of backup data and restore points grouped for the same policy, source, or period
View definitionBackup Validation
the process that confirms a backup meets defined consistency, integrity, and restorability criteria
View definitionBackup Verification
an operation that checks the technical integrity of a backup file or restore point after creation
View definitionBackup Window
the planned time window during which backups can run with acceptable production impact
View definitionBare-Metal Restore
A restoration that reconstructs a complete system on an empty or replaced machine.
View definitionBlock-Level Backup
a backup that tracks and copies changed storage blocks instead of processing each file individually
View definitionCapacity Tier
A capacity tier moves older backup restore points from performance storage to lower-cost object storage.
View definitionCrash-Consistent Backup
A crash-consistent backup captures storage state without application coordination, resembling an unexpected power loss.
View definition