Hi Dmitry
You wrote:

>> I try to backup 2.0 and restore in 1.5.2 and nothing.

DY> You need to use v1.5.2 GBAK to backup the database running on a v2.0 server.
DY> Backups made with v2.0 GBAK (or v2.0 Services API) cannot be restored on
DY> previous server versions.
Which files I must use? Only gbak.exe, or fbclient.dll, etc.

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Best regards,
Kirill Krasnov