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-⁠ZIP

Backup file is in zip (zlib) compressed format.

This is a backup-only switch;on restore, the compression is detected and decompressed automatically.

Note
Introduced in Firebird 4.0.

-⁠CO[NVERT]

Convert external tables to normal tables.

This switch causes any external tables to be backed up as if they were normal (non-external) tables.When this backup file is used to restore a database, the tables that were external in the original database will now be normal tables.

-⁠E[XPAND]

Do not apply RLE compression on backup data.

Normally, gbak will compress the output file.This switch prevents that compression from taking place.

This is a very basic RLE compression with a low compression rate, for better compression, use [gbak-cmdline-zip].

-⁠FA[CTOR]

Blocking factor.

Syntax
-FA[CTOR] block-size

If backing up to a physical tape device, this switch lets you specify the tape’s blocking factor.