diff --git a/hosts/challenger/backup.nix b/hosts/challenger/backup.nix
index b9a31f0..5690f7d 100644
--- a/hosts/challenger/backup.nix
+++ b/hosts/challenger/backup.nix
@@ -18,11 +18,26 @@
       timerConfig.OnCalendar = "05:15"; # 2h after postgresqlBackup
     };
 
+    # Transmission _metadata_
     transmission = localJob "transmission" [ "/var/lib/transmission" ];
 
-    # TODO: timemachine, nextcloud, komga, calibre
+    # Calibre metadata and books
+    calibre = localJob "calibre" [
+      "/var/lib/calibre-web"
+      "/var/lib/calibre-server"
+      "/tank/media/books"
+    ] // {
+      pruneOpts = [ "--keep-daily 1" ];
+    };
+
+    # Nextcloud data
+    nextcloud = localJob "nextcloud" [ "/tank/nextcloud" ];
+
+    # TODO: timemachine, komga
   };
 
+  sops.secrets."restic/calibre" = { };
+  sops.secrets."restic/nextcloud" = { };
   sops.secrets."restic/postgres" = { };
   sops.secrets."restic/transmission" = { };
 
diff --git a/secrets/challenger/challenger.yaml b/secrets/challenger/challenger.yaml
index cdb5579..2d71ff7 100644
--- a/secrets/challenger/challenger.yaml
+++ b/secrets/challenger/challenger.yaml
@@ -4,8 +4,10 @@ nextcloud:
     adminpass: ENC[AES256_GCM,data:DL5SnyPPUxiVjfIHZ/ZYJi2pNu6x,iv:/bThFVYgHsN3Yr2EJf0+YWhAVIei9ENaHfAH1ADC5Ws=,tag:bNp+2trtwFNYOqruvqPRGw==,type:str]
     secretsjson: ENC[AES256_GCM,data:xmdwWBe8LWsSEI64KhSeXbA1B0ahfoGwNmgl33JWteF4AakdI73zfbdIhUBqqlqfbL0uCGlqCiOyRA02h8197mk=,iv:ncKz9ObwoFoVjT0qMzBJ0BqVBNx0ScdMRl82ZNQp4FI=,tag:6S8fqHhvE/gaknxsb+q3Jg==,type:str]
 restic:
-    transmission: ENC[AES256_GCM,data:RrnlOXT6sNoUh8MF8JXFTygN+cBV+CS0xdvE9SMTAVV0,iv:0Irhejn2TQSI7h9e4G8a65EpIKmwco9ue93lgo4jC6I=,tag:RAd2pvtL++C8rdlqch4g6Q==,type:str]
-    postgres: ENC[AES256_GCM,data:MaKQs6f2sp1e42u4DRx/PUsSFnJN0Ks+BtUrMJkUwD28,iv:Wz/MtaC/hg5zVxcdZWKEHeQb5KGio653mgHf4IrE7mk=,tag:7kaYJ1DnxNGbcr31bHb0zA==,type:str]
+    transmission: ENC[AES256_GCM,data:UUf8/WV7Q7vbs05lEeqflcSj0uH9abilFF1daATyrwU=,iv:WQZ7hGRQ3/3t34aO7K5Az1AOZtR6qG4p1CqZTdsEqZA=,tag:2ELh2bYVi1sgW66FbSnVHg==,type:str]
+    postgres: ENC[AES256_GCM,data:AZv28LIbGC2oAKjbU1H4gaCZF28utJJFXlKNO/BkL0U=,iv:xOJCIoFGtnEqV80rmiBBMa3dMZnPjaDIce+MAZkGZdo=,tag:dLTwE004KGfP3z9EoMVCCw==,type:str]
+    nextcloud: ENC[AES256_GCM,data:O7qT07ns9FodnZu63cPwBqHGslfMIafFvyPPrTrYEdk=,iv:fJ7A5gLThuVumnteL1P82Gq1EtiSAPGXoCZgzJKqVQs=,tag:Hp/kI3TeZQCaM+gP1W1i7w==,type:str]
+    calibre: ENC[AES256_GCM,data:wAvhB303cUm0rJKwQ31pd8lYHJSlOzBW8BiCygF3JC8=,iv:kUFEiP8sTcaiAIW4QZ7ZfA4aqjJsIIA5mq+gVzgryaU=,tag:STHLWF+T4XeQIDSt4F63Lw==,type:str]
 sops:
     kms: []
     gcp_kms: []
@@ -30,8 +32,8 @@ sops:
             bVhLUVBWL3QyMmVjVEswZmtDRXRRUGMKizaESv67KWTOnUkZg1R0c3BkpJrDUxJR
             heau8QcBXtNS6Ct1RsJQD3oTmBPAP1NHJ2BD11kEEtpo8FhCOjcqVQ==
             -----END AGE ENCRYPTED FILE-----
-    lastmodified: "2024-10-04T19:11:52Z"
-    mac: ENC[AES256_GCM,data:sTsTQOCO6ggoz6hXKU/Nnfuvs2UjYwuYLhMZ/P+jHLV2Jn3gBnUUTsn3lEtG7fi9MOfILuTA93wdRciahAElY9me86j+TVa/9PdbW9Earh5rH7M91LyRRS74C99LedXco05gjxqc2s27ea0n25A8UF7eCgvAlD+4DP0WNUiDUcE=,iv:wn9ahsWE2RYy9pSi30Uy2/vStQCHNiwk6ZJU/OdNDuk=,tag:SZe/b9+2PuoBNZcwuS8Ong==,type:str]
+    lastmodified: "2024-10-04T22:55:35Z"
+    mac: ENC[AES256_GCM,data:KQHfywMQ3WkmIW7UaLjAKkM5v4+1yagJik+63G2pSKCtbsCq1uFWSheeRIPObVfnsu3qUHoxq943jVR17krjnsIZIzXjr6f5SNMyNo0RCcnhvlWy/cKzVU0/7ut0TMd6ZJsCZyOBgJOSxc8i0G/wgRreMEGicwifI5m8KWSpBU0=,iv:1+98COoItw2PAlJtGBA4Qx7TmNRB++FqeKJnsF1/j6w=,tag:iHzWy5AnXBXxtGnqiTfNnA==,type:str]
     pgp: []
     unencrypted_suffix: _unencrypted
     version: 3.8.1