Self-Hosted Duplicati, Arq Backup, Backblaze Alternatives

Why people look for a Duplicati, Arq Backup, Backblaze alternative

These three cover consumer and prosumer backup, and each has a real caveat rather than a fatal flaw. Backblaze's personal backup is inexpensive and honest, but your data sits with a company holding the keys unless you configure otherwise, and restoring a multi-terabyte archive means downloading it over days. Arq is a well-regarded paid client with a clean interface, but it is commercial software tied to a licence, and its value depends on the storage backend you point it at. Duplicati is open source and free, but its reputation for reliability has suffered from a long history of corruption and database-corruption issues reported by users, and its development has been intermittent — which is not what you want from the tool holding your only copy.

Which one should you pick?

Restic and BorgBackup are the two serious answers and they differ in a way that matters. Restic writes encrypted, deduplicated snapshots to any S3-compatible or SFTP backend — including, deliberately, a Backblaze B2 bucket if you want cheap storage without a closed client. BorgBackup is faster on large local datasets and has stronger integrity tooling, but needs SSH access to a real server. Kopia sits between them with a clean UI and repository format over the same ideas, and Backrest is a well-liked web UI for restic if the command line is the obstacle. Whichever you choose, the discipline that matters is not the tool: a backup is only real once you have test-restored it, and the schedule matters less than the restore you have actually performed.

Before you migrate

Self-hosting means you are the one who gets paged when something breaks at 11pm. Before committing, be honest about three things:

• Where will it run? A €4/month VPS handles most of these comfortably. A NAS or spare mini PC is even cheaper if you already own one.
• Who backs it up? A self-hosted service with no backup is worse than a cloud service, because at least the cloud service had someone else's redundancy. Set up automated backups before you migrate real data into it.
• How will you reach it remotely? Most people start with a WireGuard or Tailscale tunnel rather than exposing ports directly. That is the right instinct.

Migrating your data

Nearly every Duplicati, Arq Backup, Backblaze competitor listed above ships an import path — CSV, JSON, or a documented export format. The practical move is to migrate one project or one folder first, run both systems side by side for a week, and only then cut over. Export formats are rarely as clean as the marketing suggests, and it is much easier to notice a broken import on a test set than on five years of records.