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Everbex Cloud Object Storage Calculator
​for server, workstation, VM and ​Database Backup

Everbex Cloud Object Storage Calculator helps you estimate how much Cloud Object Storage you need for Backup-as-a-Service (BaaS) based on your workloads and backup policy.

It supports 3 common backup types:

  • VM (Image-level) – for virtual machines (e.g., Hyper-V / VMware)

  • Agent-based – for physical servers or endpoints using backup agents

  • Database – for database protection (full backup + transaction/log backups)

This calculator is designed in Strict Mode, where RPO (Recovery Point Objective) directly impacts storage sizing:

  • Shorter RPO = more restore points per day

  • More restore points = more incremental objects + metadata

  • Result: storage requirement increases as RPO becomes tighter

The results include:

  • Estimated storage (TB) by workload type

  • Recommended storage (TB) rounded up for quoting/proposal

  • Total restore points within your retention window

  • RTO-based service guidance (basic / standard / fast recovery / instant recovery approach)

Note: The calculator uses decimal TB display (1 TB = 1000 GB) for easier commercial quoting.


Key Terms

  • Retention (days)
    How long backup restore points are kept (e.g., 30 days).

  • RPO (Recovery Point Objective)

  • Maximum acceptable data loss.

  • Example: RPO ≤ 1 hour means backups/restore points are created frequently (24 times/day).

  • RTO (Recovery Time Objective)

  • How fast you need to recover service.

  • Example: RTO ≤ 4 hours usually requires local fast-restore options.

  • Monthly Full Backup

  • Adds an additional full backup each month (increases restore points and storage usage).

  • Assumptions (Compression / Dedupe / Overhead / Min restore point / Metadata per point)

  • These are global parameters used to model real-world storage usage. You can reset to default anytime.


    • Restore Point Logic

    RPO is mapped into restore points per day:

    • ≤ 15 minutes → 96 points/day

    • ≤ 1 hour → 24 points/day

    • ≤ 4 hours → 6 points/day

    • ≤ 24 hours → 1 point/day

    The calculator then estimates:

    • Full backups (weekly + optional monthly full)

    • Incrementals/logs split across restore points

    • Adds minimum restore-point size + per-point metadata overhead

    • Adds overall overhead percentage

    Example

    Scenario A: One VM workload

    A customer has:

    • 1 VM

    • Used size: 300 GB

    • Daily change: 5%

    • Retention: 30 days

    • Weekly full: Yes

    • Policy: Priority HIGH, RTO ≤ 4h, RPO ≤ 1h

    • Monthly full: No

    What happens in Strict Mode:

    • RPO ≤ 1h → 24 restore points/day

    • Retention 30 days → restore points become many (full + incremental points)

    • Storage increases not only from data, but also from:

      • minimum restore-point size floor

      • metadata overhead per point

      • global overhead %

    The calculator will output:

    • VM estimated TB

    • VM recommended TB (rounded up to 0.1 TB)

    • Total restore points within retention

    • RTO guidance: fast recovery suggested (local NAS/cache + offsite copy)

    Scenario B: Mixed workloads (typical SME)

    • VMs: 5 × 300 GB, change 5%/day, 30d, weekly full, RPO 1h, RTO 4h

    • Agents: 10 × 80 GB, change 3%/day, 30d, weekly full, RPO 24h, RTO 12h

    • DB: 2 × 200 GB, full daily, log 10%/day, 30d, RPO 15m, RTO 1h

    Result insight:

    • DB with RPO 15m creates the most restore points/day (96/day) → can drive storage growth quickly.

    • VM may dominate capacity due to large base size.

    • Agent workloads often smaller but still add points.

    The calculator will sum all 3 and produce:

    • Total TB recommendation for quoting

    • Total restore points across all items

    • The strictest RTO among items determines the overall RTO-based service recommendation



    How to Use the Calculator

    1. (Optional) Adjust Assumptions

      • Keep defaults if you’re unsure.

      • If you want to start over, click Reset Assumptions to Default.

    2. Add your backup items one by one

      • Select Backup Type (VM / Agent / Database)

      • Enter an Item Name (e.g., “Production VMs”, “SQL Server”, “ERP Database”)

      • Select Priority / RTO / RPO

      • Choose Monthly Full Backup if required

      • Fill in the workload fields (count (qty), used size, change rate, retention, etc.)

      • Click Add Item

    3. Repeat until all workloads are added

      • You can edit values directly inside the table later.

    4. Click “Calculate”
      You will get:

      • Total storage estimate and recommendation (TB)

      • Per-type storage recommendation

      • Total restore points based on retention

      • RTO service recommendation guidance

      • Backup Item Summary table (policy + storage + restore points)

    5. Export to PDF

      • After calculation, click Export (Items + Results) to PDF

      • The PDF includes item snapshot + results + summary table


    • Everbex BaaS – Cloud Object Storage Calculator

    Everbex BaaS – Cloud Object Storage Calculator

    Strict Mode: RPO impacts storage sizing by modeling restore points/day with minimum restore-point size + per-point metadata overhead. Display uses decimal TB (1 TB = 1000 GB).

    Assumptions (Defaults)

    Applies to all items unless you change them.

    Add Backup Item (with RTO/RPO Policy)

    Backup Items

    Edit values directly in the table. Click Calculate to update results.

    TypeNameParameters (editable)Policy (editable)RetentionAction
    No items added yet.

    Results

    VM: —Agent: —DB: —
    Grand Total: —
    Overall Storage Recommendation: —
    Total Restore Points (Retention): —
    RTO-Based Service Recommendation: —
    Per-Type Storage Recommendation
    —

    Backup Item Summary

    Compact table (better for PDF export).
    ItemStorage (Est / Reco)Restore PointsPolicy & Recovery
    No calculation yet.
    Generated time: —