gyb: add page

pages/common/gyb.md

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+# gyb
+
+> Command line tool for locally backing up Gmail messages using Gmail's API over HTTPS.
+> More information: <https://github.com/GAM-team/got-your-back>.
+
+- Estimate the number and the size of all emails on your Gmail account:
+
+`gyb --email {{[email protected]}} --action estimate`
+
+- Backup a Gmail account to a specific directory:
+
+`gyb --email {{[email protected]}} --action backup --local-folder {{path/to/directory}}`
+
+- Backup only important or starred emails from a Gmail account to the default local folder:
+
+`gyb --email {{[email protected]}} --search "{{is:important OR is:starred}}"`
+
+- Restore from a local folder to a Gmail account:
+
+`gyb --email {{[email protected]}} --action restore --local-folder {{path/to/directory}}`