SaaS vs Self-Hosted: The Real Cost Math Over 5 Years

When deciding between using a Software-as-a-Service (SaaS) solution or self-hosting, it's essential to consider the full cost of ownership over an extended period. This document provides a detailed comparison focusing on both financial and time-related expenses.

SaaS True Cost

The initial impression might be that SaaS is cheaper: "Just $12/month for Bitwarden Family, versus $0 for self-hosted Vaultwarden." However, this overlooks several important factors:

• Subscription Costs: The recurring subscription fee over a 5-year period.
• Price Increases: Future price hikes due to inflation or company policy.
• Exit Cost: Potential costs associated with migrating away from the SaaS service.

However, what SaaS includes is often overlooked:

• Hosting and Maintenance: Managed hosting, backups, security updates, and uptime support are provided by the provider.
• Support: Dedicated customer support is usually included in the subscription plan.

Example: Family Password Manager

Let's consider a family password manager scenario for 5 years:

• SaaS (Bitwarden Family ~$40/yr):
  • Total cost over 5 years: $200.
  • No administrative time required.

Self-Hosted True Cost

Self-hosting involves more upfront and ongoing costs, but it offers greater control and flexibility. Here’s a breakdown:

Hardware Costs

• Shared Mini PC: Power consumption (real measurement needed).
• VPS Rent: If using a virtual private server instead of physical hardware.

Time Costs

• Initial Setup: Hours to days depending on complexity.
• Maintenance: Regular updates (monthly) and occasional incident handling.
• Backup Management: Configuring and testing backups.
• Security Responsibility: Ensuring the service is always up-to-date and secure.

Example: Family Password Manager

For a family of 4, over 5 years:

• Self-hosted (Vaultwarden):
  • Software cost: $0.
  • Power cost: ~$5/yr for a shared mini PC.
  • Initial setup time: 1-2 hours.
  • Annual maintenance: ~30 minutes.
  • Total cash outlay: Under $50, plus ~5 hours of your time.

Verdict

In this example, self-hosting wins because the service is light and the software is excellent. The existing server also reduces marginal costs. However, the calculus can change depending on the specific use case:

• When Self-Hosting Wins:

  • Server already exists and runs anyway.
  • Per-user pricing multiplies (e.g., 10 users x $12).
  • Data sovereignty matters to you.
  • The hobby is the point (time spent is entertainment, not cost).

• When SaaS Wins:

  • Service is customer-facing for a business run alone.
  • Uptime and reliability are critical.
  • Being down costs money or trust.
  • Email services.
  • Any service you’d resent maintaining.

Hybrid Approach

Most homelabbers find themselves in a hybrid situation, where they self-host the fun and private aspects (photos, passwords, media, notes) while renting out critical and thankless services like email monitoring and offsite backup storage.

Summary

Choosing between SaaS and self-hosting involves balancing initial costs with ongoing expenses and time commitments. For light use cases in a homelab setting, self-hosting can be more cost-effective and flexible. However, for business-critical or high-uptime requirements, SaaS might be the better choice.