Inkscape SVG and File System Interoperability for Backup Integrity

Question

Inkscape utilizes a file-system-level approach to data preservation by generating .svg~ backup files during the save process. This mechanism relies on the operating system's ability to handle these extensions and the user's manual intervention to rename and restore the file to its original .svg state.

While the creation of these files is a documented behavior, there is a lack of an internal verification layer to ensure that the recovered data maintains structural integrity or matches a specific previous state. This creates uncertainty when restoring complex vector documents where silent corruption might occur during the save-to-backup cycle.

Does Inkscape provide any internal checksums or metadata within the .svg~ file to verify data integrity upon restoration?
  Is there a documented method to programmatically validate that a recovered backup is bit-identical to the state it intended to preserve?

Tasadduq Burney · Answer

Answer
Inkscape does not embed any checksum, signature, or integrity metadata in the .svg~ backup file, and there is no documented programmatic API that can verify a restored backup is bit‑identical to the version it was meant to preserve.
Confirmed facts

The .svg~ file is a plain filesystem copy of the SVG document created at the previous save operation.
  Its content is standard SVG XML, identical in format to a normal .svg file, with no extra blocks or metadata sections.
  Inkscape’s preferences control whether the backup is created, but the backup mechanism itself does not add verification data.

Likely explanation
The tilde backup is intended as a simple, user‑accessible fallback that relies on the operating system’s file‑level copy. Because it is meant to be a quick undo rather than a versioned store, Inkscape omits internal integrity checks to keep the process lightweight.
Steps to verify integrity yourself

Before saving, compute a cryptographic hash of the current .svg file (e.g., sha256sum file.svg).
  After Inkscape creates the .svg~ backup, compute the hash of that backup.
  If the two hashes match, the backup is bit‑identical to the saved state.
  Optionally, open the restored .svg~ in Inkscape or run an XML validator to confirm the file is well‑formed SVG.

If you need to automate this check, script the hash comparison in your backup workflow; Inkscape does not provide a built‑in command for it.

Inkscape SVG and File System Interoperability for Backup Integrity

1 answer

Answer

Confirmed facts

Likely explanation

Steps to verify integrity yourself

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