Cloud Storage & Office Suites · 2026 reliability ranking
Most Reliable Cloud Storage & Office Suites (2026)
We ranked 16 cloud storage & office suites by real-world reliability over the last 90 days, using 38 status page incidents and our own around-the-clock uptime checks. A small business's email, shared files and documents usually live with one cloud storage or office suite provider, so an outage there can stop everyone from opening contracts, sending quotes or reading customer email at the same time. Sync and sign-in failures also cause slower damage: files that fail to upload, conflicting copies and staff locked out of shared folders. Because switching providers means moving years of files and mailboxes, a vendor's incident history is worth checking before you commit.
Last updated Nov 2, 2026 · How we score
| # | Vendor | Score | Uptime (90d) |
|---|---|---|---|
| 1 | TresoritTresorit is an end-to-end encrypted cloud storage and file sharing service, majority-owned by Swiss Post.Visit site ↗ | 100.0 | 100% |
| 2 | SugarSyncSugarSync is a cloud file sync, sharing and online backup service for individuals and businesses.Visit site ↗ | 99.2 | 100% |
| 3 | ShareFileShareFile is a secure file sharing and client portal service for businesses, owned by Progress Software since 2024 (formerly Citrix ShareFile).Visit site ↗ | 96.0 | 99.99% |
| 4 | EgnyteEgnyte is a cloud file sharing and content governance platform for businesses from Egnyte, Inc., based in Mountain View, California.Visit site ↗ | 92.7 | 99.94% |
| 5 | DropboxDropbox is a cloud file storage, sync and sharing service from Dropbox, Inc., based in San Francisco.Visit site ↗ | 85.5 | 99.88% |
| 6 | Sync.comSync.com is an end-to-end encrypted cloud storage and file sharing service from Sync.com Inc., based in Toronto.Visit site ↗ | 82.1 | 99.82% |
| 7 | Proton DriveProton Drive is the end-to-end encrypted cloud storage and document service from Proton AG, based in Geneva, sold alone or with Proton Mail and Calendar.Visit site ↗ | 77.0 | 99.65% |
| 8 | BackblazeBackblaze is a cloud storage company in San Mateo, California, offering B2 Cloud Storage and Computer Backup.Visit site ↗ | 62.4 | 99.50% |
| 9 | Google WorkspaceGoogle Workspace is Google's subscription suite for businesses, including Gmail, Google Drive, Docs, Sheets, Slides and Calendar.Visit site ↗ | 55.0 | 99.19% |
| 10 | BoxBox is a cloud content management and file sharing platform from Box, Inc., based in Redwood City, California.Visit site ↗ | 42.1 | 97.88% |
Cloud Storage & Office Suites reliability at a glance
- Across the 10 ranked cloud storage & office suites, average 90-day uptime is 99.58%. Reliability scores range from 100.0 (Tresorit) to 42.1 (Box).
- Together they published 38 incidents in the last 90 days, 24 of them partial or major outages.
- Tresorit reported no incidents at all in that time.
- The typical vendor takes 4h 57m to resolve an incident. Egnyte is fastest, at 53m on average.
- Box reported the most incidents (18 in 90 days).
What to check before you choose a cloud storage & office suite
- Check which parts fail most often. Sign-in, file sync and email delivery outages stop work, while problems with add-ons such as AI assistants or reporting usually don't.
- Make sure the desktop and mobile apps keep local copies of the files your team needs, so people can keep working offline and sync once service returns.
- Look at how long incidents last and whether they hit your working hours. Several short daytime sync problems can cost more than one overnight outage.
- Keep a separate backup of critical files and mailboxes. A sync service copies deletions and corruption as faithfully as it copies good files.
90-day uptime history
Each bar is one day. Hover a bar for that day's uptime and incidents.
1. Tresorit
100% uptime · 0 incidents · avg resolve —2. SugarSync
100% uptime · 2 incidents · avg resolve —3. ShareFile
99.99% uptime · 3 incidents · avg resolve 1h 17m4. Egnyte
99.94% uptime · 3 incidents · avg resolve 53m5. Dropbox
99.88% uptime · 3 incidents · avg resolve 4h 54m6. Sync.com
99.82% uptime · 1 incidents · avg resolve 7h 33m7. Proton Drive
99.65% uptime · 3 incidents · avg resolve 3h 11m8. Backblaze
99.50% uptime · 2 incidents · avg resolve 19h 55m9. Google Workspace
99.19% uptime · 3 incidents · avg resolve 1d 4h10. Box
97.88% uptime · 18 incidents · avg resolve 5h 1m- No incidents
- Degraded
- Partial outage
- Major outage
- No data
Being tracked (not ranked yet)
These vendors join the ranking once we have enough evidence: at least 14 days of data, and for vendors with a quiet status page (silent for a year, or for 90 days while their competitors report several incidents), 30 days of our own independent monitoring.
- iCloud · quiet status page, awaiting our own monitoring
- Microsoft 365 · quiet status page, awaiting our own monitoring
- Zoho Workplace · quiet status page, awaiting our own monitoring
- IDrive · no public status page
- MEGA · no public status page
- pCloud · no public status page
Recent Cloud Storage & Office Suites incidents
New incident: "Customers in the US east region might be facing issues with downloads"
[Medium] Issue with multiple Box Services
Affected: Content API, Uploads/Downloads, Box Sign, Box Sign
[Major] Issue with Box Driveofficial update ↗
Affected: Box Drive
[Critical] Issues with Multiple Box Services
Affected: Content API, Login/SSO, Web Application, Content Preview, Uploads/Downloads, Authentication (OAuth 2.0 / JWT) +17 more
[Medium] Issue with Enterprise Event Reportsofficial update ↗
Affected: Events API, Enterprise Reports
Intermittent issues with Cloud Migration Manager
Affected: Migration Services
Affected: Sync
Head-to-head comparisons
- Tresorit vs SugarSync reliability
- Tresorit vs ShareFile reliability
- Tresorit vs Egnyte reliability
- Tresorit vs Dropbox reliability
- SugarSync vs ShareFile reliability
- SugarSync vs Egnyte reliability
- SugarSync vs Dropbox reliability
- ShareFile vs Egnyte reliability
- ShareFile vs Dropbox reliability
- Egnyte vs Dropbox reliability
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Frequently asked questions
What is the most reliable cloud storage & office suite?
Based on the last 90 days of data, Tresorit is the most reliable cloud storage & office suite we track, with a reliability score of 100.0/100 and 100% uptime.
How do you measure cloud storage & office suite reliability?
We poll each vendor's public status page every few minutes, record every incident, and run our own uptime checks against each vendor's login and customer-facing pages. Uptime (40%), incident frequency (20%), average time to resolve (20%) and transparency (20%) combine into one score out of 100.
How often are these rankings updated?
Continuously. Status pages and uptime checks run every five minutes and scores are recalculated several times an hour.
Can vendors pay to rank higher?
No. Sponsored placements are clearly labelled, shown separately from the rankings and never change a vendor's score.