Use the method
Practical guides for ArrayKeep Storage Planner
ArrayKeep connects a drive purchase question to a retention workload. First calculate a conservative usable array capacity, then model full data, daily changes, copies, and overhead. Keep the backup distinction visible throughout.
Practical guide
Estimate usable NAS capacity from a RAID layout
Use equal-drive assumptions and a free-space reserve to compare raw RAID capacity with usable planning space.
Read guidePractical guideCompare NAS capacity with a retention workload
Model full backup data, daily changes, copies, and overhead before deciding how much space the plan needs.
Read guideRead the calculation methodology and reference sources
Method and examples reviewed 2026-09-30. Examples are illustrative; input values and specifications are not independently verified.