Saves, Blown, Saves and Holds for a Player
https://www.baseball-reference.com/players/j/janseke01.shtml#all_players_standard_pitching
Blown Saves, Holds, and other stats for relievers can be found in the Reliever Pitching table on Advanced Stats pages.
https://www.baseball-reference.com/players/j/janseke01-pitch.shtml#all_pitching_reliever
To access that page, click Finders & Advanced Stats in the navigation bar on player pages, then click Advanced Stats.
Saves, Blown, Saves and Holds for a Team
League-wide Saves, Blown, Saves and Holds
This page has a summary of each team’s reliever data, as well as a table with the individual stats for every reliever in the league. Here is that page for the 2025 season:
https://www.baseball-reference.com/leagues/majors/2025-reliever-pitching.shtml
There are many more stats located in the Relief Pitching tables than just Saves, Blown Saves and Holds. Those tables also include stats for Inherited Runners, Inherited Runners Scored, Games Won and Lost in relief, a breakdown of appearances by game leverage, games on zero days rest, and many others. Clicking the red "Glossary" link above the table will bring up definitions for each of the stats contained in the table.