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docs: spell out .spbk and .spde extensions

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SelfPost backup / SelfPost domain export — in the guide, security notes,
architecture, and Backup/Export panel copy.

Co-Authored-By: Composer <noreply@cursor.com>
Co-authored-by: Cursor <cursoragent@cursor.com>
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mixeme
2026-08-09 00:49:43 +03:00
parent 1dd0aa9fea
commit 18880a8286
7 changed files with 27 additions and 17 deletions
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docs/guide.md
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@@ -332,8 +332,11 @@ file that comes down is an encrypted envelope instead of the plain archive:
| Artefact | Plain | Encrypted |
|----------|-------|-----------|
| Full backup | `.tar.gz` | `.spbk` |
| Domain export | `.json` | `.spde` |
| Full backup | `.tar.gz` | `.spbk` (**S**elf**P**ost **b**ac**k**up) |
| Domain export | `.json` | `.spde` (**S**elf**P**ost **d**omain **e**xport) |
The suffixes are for the operator only — the server detects an encrypted file
by its magic bytes (`SELFPOST1`), not by the extension.
The key is derived from the password with scrypt and the contents are sealed
with AES-256-GCM, in chunks, so a truncated or altered file fails to open rather