The Sabres signed goalie Jhonas Enroth out of the Swedish league. While not good enough to be a starter, he could easily be the Sabres backup in this upcoming season. With Thibault not expected to be resigned, having a promising rookie in the number two position would be a good fir for the team.
Enroth was a finalist for rookie of the year last year in Sweden, and despite not being on that great of a team, had a pretty good year himself. He is only 19 and could very well take over the starting position if he is still here in six or so years.
At the very least having a possible future backing up in goal is much preferable to having a veteran on a one year contract.