Office 365 Backup Tool — Technical Specs

System requirements, supported formats and trial limit for Office 365 Backup Tool.

System Hardware & OS Support Matrix

Operating System Windows 11, Windows 10, Windows Server 2022/2019/2016, macOS 15 Sequoia, macOS 14 Sonoma, macOS 13 Ventura, Apple Silicon (M1/M2/M3/M4) & Intel 64-bit

Processor / CPU 1 GHz Intel/AMD or Apple Silicon M-Series (M1-M4)

Memory (RAM) 4 GB minimum (8 GB recommended for 100GB+ enterprise tenants)

Disk Installation Space 250 MB free disk space for installation

Deep Architecture Specifications

Cloud API & Authentication

Authentication Protocol OAuth 2.0 PKCE Modern Auth & Azure AD App Registration

Supported Cloud Plans Microsoft 365 Business, Enterprise (E3/E5), Exchange Online Plan 1/2, Education (A3/A5), GCC High

Target Mailbox Types User Inboxes, Shared Mailboxes, Room/Equipment Mailboxes, In-Place Archives

API Throttling Defense Adaptive rate limiting with exponential backoff & jitter on HTTP 429 signals

Session Checkpointing SQLite ACID journal enables instant resume of interrupted 50GB+ mailbox downloads

Output & Archival Formats

Mailbox Container Formats Outlook Unicode PST (64-bit), MBOX (RFC 4155), EML (RFC 822), MSG (Compound Binary)

Legal & Document Formats ISO 19005-1 compliant PDF/A with embedded attachments and Bates numbering, HTML5, CSV

PST Auto-Split Engine Splits large output PST files at 2 GB, 5 GB, 10 GB, 20 GB, or 50 GB boundaries

Contact & Calendar Extraction vCard (.vcf) address books, iCalendar (.ics) appointments with recurrence rules

Data Handling Processing runs on your computer. Data goes only to the mail provider or cloud destination you choose.

Supported Source & Target Formats

Input Source Formats (0)

Input formats and direct connection sources are documented in the product guide.

Output Target Destinations (0)

Export destinations and target profiles are documented in the product guide.

Free trial limit

50 items per folder

The free trial exports up to 50 items per folder so you can verify conversion fidelity before purchasing.

Download Free Trial

Test performance on your hardware with a 50-item preview export limit.

Download Trial Installer