An information management system, wherein the information management system includes: a first image forming apparatus that includes a first storage device (106, 116) and is configured to transmit data stored in the first storage device (106, 116); a second image forming apparatus that includes a second storage device (106, 116) and is configured to download the data and to store the data in the second storage device (106, 116); and an information management server that is configured to store the data from the first image forming apparatus in a third storage device, and to transmit the data stored in the third storage device according to a download request from the second image forming apparatus; wherein the first image forming apparatus has a first system control unit that, when there is an instruction to start backup of the data, is configured to transmit the data to the information management server; the second image forming apparatus has a second system control unit that, when there is an instruction to start setting, is configured to issue the request including a storage capacity of the second storage device (106, 116) to the information management server; the information management server has a third system control unit that is configured to read the data according to the storage capacity of the second storage device (106, 116) from the third storage device and to transmit the data to the second image forming apparatus; the information management server has a backup information management unit; the first system control unit is configured to transmit first model identification information that includes information indicating a model; the second system control unit is configured to transmit second model identification information that includes information indicating a model; the backup information management unit is configured to manage the data from the first image forming apparatus in association with the first model identification information; the third system control unit, in a case where a model included in the second model identification information matches a model included in the first model identification information, is configured to transmit all of the data stored in the third storage device, and in a case where a model included in the second model identification information does not match a model included in the first model identification information, is configured to determine whether or not the data fits in a storage capacity of the second storage device (106, 116) to read the data that fits in the storage capacity of the second storage device (106, 116) from the third storage device and to transmit the data. a first image forming apparatus that includes a first storage device (106, 116) and is configured to transmit data stored in the first storage device (106, 116); a second image forming apparatus that includes a second storage device (106, 116) and is configured to download the data and to store the data in the second storage device (106, 116); and an information management server that is configured to store the data from the first image forming apparatus in a third storage device, and to transmit the data stored in the third storage device according to a download request from the second image forming apparatus; wherein the first image forming apparatus has a first system control unit that, when there is an instruction to start backup of the data, is configured to transmit the data to the information management server; the second image forming apparatus has a second system control unit that, when there is an instruction to start setting, is configured to issue the request including a storage capacity of the second storage device (106, 116) to the information management server; the information management server has a third system control unit that is configured to read the data according to the storage capacity of the second storage device (106, 116) from the third storage device and to transmit the data to the second image forming apparatus; the information management server has a backup information management unit; the first system control unit is configured to transmit first model identification information that includes information indicating a model; the second system control unit is configured to transmit second model identification information that includes information indicating a model; the backup information management unit is configured to manage the data from the first image forming apparatus in association with the first model identification information; the third system control unit, in a case where a model included in the second model identification information matches a model included in the first model identification information, is configured to transmit all of the data stored in the third storage device, and in a case where a model included in the second model identification information does not match a model included in the first model identification information, is configured to determine whether or not the data fits in a storage capacity of the second storage device (106, 116) to read the data that fits in the storage capacity of the second storage device (106, 116) from the third storage device and to transmit the data.