exe.dev adds incremental VM backups to your own S3 bucket in open Casync format
davidcrawshaw · x · 2026-11-13
exe.dev shipped backup and restore commands for its cloud VMs, storing snapshots in the user's own S3 bucket via a WIF integration.
Key technical details:
- Uses the same open format as Casync/Desync: disks are split into 1 MB chunks, hashed, compressed, and uploaded by hash, skipping unchanged chunks for incremental backups
- A backup is represented by an index of chunk hashes; slow-changing disks only update a few chunks per run
- Because the format is open source, images can be reconstructed elsewhere or lazily mounted via FUSE
- The team even suggests using your coding agent to walk through the setup docs
Docs at exe.dev/docs/vm-backups.
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