Business Internet with Backup: How to Ensure Uninterrupted Connectivity Even During Primary Connection Outage

Business internet with backup is a standard requirement in 2026 for any organization whose operations depend on uninterrupted connectivity. An outage of the primary internet connection without a functional backup means interrupted access to cloud ERP, non-functional VoIP telephony, loss of remote employee access, and — in the case of manufacturing companies — shutdown of production lines dependent on cloud control systems. New Telekom s.r.o. delivers business internet with automatic backup combining primary FTTO fiber connection with LTE-A Pro or 5G backup connection via eSIM — with failover within 10 seconds without manual intervention, under a single contract, and with unified 24/7 NOC monitoring.

Why is one internet connection — even with a guarantee — not enough?

Even the best-designed primary connection with 99.9% SLA does not mean zero outage risk. 99.9% SLA corresponds to a maximum of 8.7 hours of outage per year — an acceptable number from a contractual perspective, but from the perspective of a manufacturing plant or e-commerce platform during a seasonal campaign, potentially catastrophic. The most common causes of primary business internet outage are not related to the quality of the operator itself:

• Third-party excavation work — damage to fiber optic cable during construction work near the building is the most common cause of unplanned outage in densely built-up areas of Prague, Brno, and industrial zones
• Failure of an active element on the last mile — switch or media converter failure in the building's distribution rack
• Power outage in the building or technical room without backup power for active equipment
• Physical damage to the cable route — vandalism, flood, fire in the technical room

For each of these causes, the same applies: a backup connection on a different physical technology — mobile network instead of fiber — is immune to them. An excavation that cuts the fiber cable does not affect the LTE signal.

What types of backup for business internet does New Telekom offer?

LTE-A Pro backup via eSIM — standard for most companies

LTE-A Pro backup connection via eSIM with eUICC is the most frequently deployed backup solution for business internet in the Czech Republic and abroad. LTE-A Pro technology (carrier aggregation of bands B1/B3/B7) achieves real throughput of 100–300 Mbit/s depending on location and coverage — sufficient to maintain critical business operations during primary connection outage. The key advantage of eSIM with eUICC over a classic physical SIM card: the chip is integrated directly into the router — resistant to vibrations and industrial environments, without mechanical contact prone to failure. The operator profile can be remotely changed via Remote SIM Provisioning (GSMA SGP.22) without physical access to the device. For branches in production halls, remote locations, or abroad, this is a critical operational advantage. New Telekom supplies eSIM with eUICC with coverage in more than 240 countries — the backup internet works the same in Prague, Brno, Ostrava, as well as in a branch in Munich or Shanghai, always managed from a single portal.

5G backup — for locations with coverage and higher demands on backup capacity

In locations with available 5G coverage (Prague, major industrial centers of Brno, Ostrava), New Telekom offers a backup connection using 5G technology with real throughput of 300–800 Mbit/s — suitable for customers who need to maintain full performance of cloud applications or data transfer when the backup is active.

Second fiber route — for absolute availability

For customers with the highest availability requirements — manufacturing plants in continuous three-shift operation, data centers, financial institutions under DORA (EU Regulation 2022/2554), or hospitals — the optimal combination is two physically separate fiber routes running along different streets plus a mobile backup connection as a third layer. This three-tier architecture is resistant to excavation work (two routes on different streets), mobile network outage (two fiber routes), and outage of an entire transmission medium.

How does automatic failover work in practice?

Automatic failover — switching traffic to the backup connection without manual intervention — is technically implemented by SD-WAN logic on the Juniper NFX250 router, which New Telekom deploys as standard CPE equipment for customers with backup connections. The router continuously measures the quality of the primary connection using health checks — ICMP ping to two independent checkpoints with 3-second intervals. Upon detection of an outage (three consecutive failed attempts) or significant degradation (packet loss above a defined threshold), SD-WAN switches all traffic to the backup LTE or 5G connection — the entire process takes 7–10 seconds. After restoration of the primary connection, automatic failback occurs — with a configured delay of 60 seconds to verify the stability of the restored link before switching back. The customer does not intervene manually in the process.

QoS prioritization on the backup connection

The backup LTE or 5G connection typically has lower capacity than the primary fiber link. SD-WAN logic therefore automatically applies a QoS policy during backup activation that reserves backup capacity for critical traffic:

• Highest priority (EF DSCP): VoIP and video conferencing (Microsoft Teams, Cisco Webex, SIP Trunk)
• High priority (AF41): ERP systems (SAP, Microsoft Dynamics), remote access (VPN)
• Standard priority: other cloud applications (Microsoft 365, Google Workspace)
• Paused or strongly limited: software updates, backups, logs — traffic that can wait for primary connection restoration

The result is that during active LTE backup, the customer does not experience degradation of VoIP calls or slowness of the ERP system — only possible slowdown of large file downloads or updates.

What parameters should a business internet with backup contract include?

For which types of companies is internet with backup most important?

Manufacturing companies in Prague, Brno, and industrial zones — operate cloud ERP, production control systems, and MES (Manufacturing Execution System); internet outage means production stoppage. E-commerce and logistics platforms — every hour without connectivity means lost orders and customer service unavailability; seasonal campaigns like Black Friday are particularly sensitive. Financial institutions and insurance companies — subject to DORA (EU Regulation 2022/2554), which explicitly requires measures to ensure availability of ICT services; backup connectivity is part of an auditable digital resilience architecture. Healthcare facilities — operate cloud EHR (electronic health records) and imaging systems (PACS); internet outage at a hospital or clinic has a direct impact on patient care. Law firms and consulting companies — work with sensitive client data in cloud DMS systems; an outage during a court hearing or transaction is not excusable. Companies with branches abroad — Prague headquarters' cloud access is shared via MPLS WAN with branches in Germany, Poland, or other countries; outage of the central internet node in Prague affects the entire network. Data centers and server hosting — colocation data center customers in Prague operate infrastructure for third parties; data center internet connectivity outage is an SLA breach toward their own customers.

How does New Telekom ensure monitoring of the backup connection?

A backup connection that no one monitors is a backup you don't know works — until you need it. The New Telekom NOC (Network Operations Center) monitors 24/7 both the primary and backup connections of every customer:

• Continuous health check of primary and backup connection with alerting upon degradation
• Automatic customer notification when switching to backup — the customer knows immediately that backup is active and when the primary went down
• Reporting on the number and duration of backup connection activations per month — transparent overview of actual availability
• Proactive monitoring of backup LTE signal quality — upon long-term signal degradation in the area, the NOC team recommends optimization (band change, antenna relocation)

All incidents — failover to backup, primary connection outages, automatic failbacks — are logged with timestamps and available to the customer for their own reporting and possible SLA claims.

Real-life cases where backup internet saved operations

Manufacturing plant in Brno — Slatina: Primary fiber link cut by excavation work in the industrial zone. Backup LTE-A Pro connection activated within 7 seconds. Production continued uninterrupted for 4 hours until fiber repair. Without backup: production line stoppage with direct loss estimated at CZK 85,000. Details in the case study of business internet with backup in Brno. E-commerce holding in Prague with hybrid cloud infrastructure: primary internet connection outage on Friday evening before a weekend discount event. Backup activated automatically, platform ran continuously throughout the weekend. Outage losses: zero. Law firm in Prague 1: Primary connection outage during a video conference hearing with a client. Backup LTE connection took over within 9 seconds — the hearing continued without interruption, the customer didn't even notice the outage. Details in the case study of business internet in Prague 1.

What is the cost of backup business internet?

A backup LTE-A Pro or 5G connection via New Telekom eSIM is a marginal item from the perspective of total IT infrastructure costs — monthly costs for backup connectivity are significantly lower than the cost of a single one-hour outage of critical operations for most companies. Exact prices depend on the specific configuration, location, and data volume — New Telekom prepares a price calculation as part of the free location survey. The customer receives an offer with precisely defined SLA parameters, described failover logic, and backup capacity specifications — no hidden conditions, no additional fees for backup activation.

Frequently asked questions about business internet with backup

Do I need to have backup from the same operator as primary internet?

You don't have to — but it is significantly more advantageous. If primary and backup are from different operators, during an outage you coordinate two different points of contact, two different escalation procedures, and two different contracts. New Telekom supplies the primary FTTO connection and the backup LTE/5G connection under a single contract — one point of contact, one NOC, one invoice.

How do I know that the backup internet actually works before I need it?

The New Telekom backup connection is continuously monitored by the 24/7 NOC — not just the primary, but the backup as well. In addition, we perform regular failover tests at agreed times: intentional disconnection of the primary connection and verification of automatic failover to backup with measurement of failover time. Test results are provided to the customer in writing. A backup that has never been tested is not a true backup.

Can the backup LTE connection be used outside of backup — for example, for low-data IoT operations?

Yes. The eSIM with eUICC from New Telekom is managed via a portal that allows allocating data volumes even for "idle" operation outside active backup — for example, for collecting telemetric data from production machines or remote monitoring systems. The customer can thus use the backup eSIM connectivity productively even when the primary fiber is working normally. More details at New Telekom IoT connectivity.

Is backup internet mandatory for companies under NIS2?

Act No. 264/2025 Coll. (NIS2 transposition) does not explicitly require backup internet connection as a specific technical measure — it requires implementation of measures proportionate to the risk to ensure availability of key ICT services. For most obligated entities, backup connectivity is the most straightforward and cheapest way to meet this measure and demonstrate it during a NÚKIB audit. Companies under New Telekom NIS2 compliance consulting receive backup connectivity as a standard part of the recommended security architecture.

Does backup LTE internet work for foreign branches as well?

Yes. The eSIM with eUICC from New Telekom provides backup connectivity in more than 240 countries — the same eSIM card works at the Czech headquarters, at the German branch, and at the manufacturing plant in Asia. Management of all backup eSIM cards is done from a single portal, invoicing on a single invoice. For international companies with branches abroad, this is a key advantage over local mobile operators with limited roaming.

Conclusion

Business internet with backup is not a luxury or an unnecessary expense — it is insurance whose value becomes apparent the moment you need it. The combination of primary FTTO fiber connection with automatic LTE-A Pro or 5G backup via eSIM, SD-WAN failover logic, and unified 24/7 New Telekom NOC monitoring ensures availability exceeding 99.9% and automatic failover within 10 seconds — without needing to call an operator or manually configure the network. Verify the availability of business internet with backup at your address on the coverage page, or contact the New Telekom team via the contact form — the free location survey includes verification of the fiber route and measurement of LTE signal quality inside the building. A backup that was not designed for your specific location may not work as you expect.

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This article was prepared by the expert team of New Telekom s.r.o. Information corresponds to the technological and legislative state as of May 2026.

Technologies and standards used

• Juniper NFX250 — SD-WAN CPE router, failover orchestration, QoS DiffServ
• 3GPP LTE-A Pro — backup mobile connectivity, carrier aggregation B1/B3/B7
• 5G NR — backup mobile connectivity for locations with coverage
• eSIM / eUICC — GSMA SGP.22, Remote SIM Provisioning
• FTTO, OS2 Single-Mode — primary fiber connection
• BGP, MPLS, IPv4/IPv6 dual-stack — network protocols
• EF DSCP, AF41 — QoS traffic classification on backup connection
• NIX.CZ — Neutral Internet eXchange Prague
• Act No. 264/2025 Coll. (NIS2) — availability of key ICT services
• EU Regulation 2022/2554 (DORA) — digital operational resilience
• NÚKIB — National Office for Cyber and Information Security