BorgBackup

BorgBackup is the backup tool you pick when every byte of storage costs money. It delivers best-in-class deduplication and compression, squeezing backups roughly 10% smaller than Restic with the same Zstandard settings. If you're running a homelab or VPS with limited disk, that adds up fast.

Restic is the main rival — faster at creating backups and natively supports S3, which Borg doesn't without rclone bolted on. Kopia is the newer contender with a GUI and parallel cloud uploads. For commercial, Backblaze B2 with any of these works, but there's no SaaS worth paying for when OSS is this good.

Use Borg if you back up to local or SSH targets and care about storage efficiency. It also sips less RAM than Restic — a real win on cheap VPS instances.

The catch: no native Windows support and no built-in cloud storage. If you need S3 or cross-platform, Restic is the easier path.