Signaltap retrieve data .... after having plugged JTAG

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is it possible to plug the jtag (usb blaster or other) and retrieve captured data (aquire data a postiori) with signaltap?

I mean :

1. Program a FPGA with SignalTap,

2. Let the board functionning alone, let internal SignalTap capture data because trigger has occured
3. Plug USB Blaster

I know there is a power up capture, but I want to retrieve data after an other trigger condition was met.

Is it possible ?

notes :

(1) : Does SignalTap work alone in FPGA = without having to press "Run analysis" ?

(2) : Is there an risk of loosing FPGA configuration when pluggin USB Blaster ?

Cordially.

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Why can't you do it in the usual order?

1. Plug in USB BLASTER

2. Launch Quartus > SignalTap program the FPGA with SignalTap

3. Let the board function and capture data when it triggers.

4. Download data.