cgsecurity.org

All you need to know i wrote in the above comment #6.

Hi,

i installed photorec and tmux (keeps the photorec session alive when log off from nas). You can install photorec manually but its a bit tricky. I recommend to use the package from https://synocommunity.com/. You can find tmux too on this site as a install package. Search the site for install ...

I solved the problem by using tmux, a so called modern version of screen. Found it here :
https://synocommunity.com/ as ready to install package for the NAS. I also found there TestDisk as ready to install package.
All works fine now

Thank you for fast response. Screen is not available on DS213+. Seems i have to cross-compile it for the DS213+? Can i use the tool-chain i have downloaded to compile photorec?
(Example from here: http://www.cgsecurity.org/wiki/Cross_compile_TestDisk_for_Synology_NAS, i grabed the tool-chain for ppc ...

On my Synology DS213+ (1x 4TB HD) i deleted 2 directorys with .raw images (Sony Alpha 57). I cross-compiled photorec for Synology DS213+ to recover the files.
All works fine via ssh. It will take nearly 80h to finish. I dont want to keep the ssh session and this notebook on till its finished. I ...