The ABAP Development Tools for SAP NetWeaver will allow you to deploy to SAP from inside eclipse.
If you will not or can not use this tools, there is a special report that will allow you to do this using the SAP GUI.
There are some possibilities depending on your installed technical base.
1) Systems with installed SAPUI5 infrastrucure
Using Transaction SA38 you can start the Programm /UI5/UI5_REPOSITORY_LOAD to load SAPUI5 app from and to local filesystem.
2) All other systems
2.1) Using Transaction SA38 you can start the Programm BSP_UPDATE_MIMEREPOS to batch upload MIMES to the repository (download is also available to get data from SAP to local).
|Transaction SA38 - Program: BSP_UPDATE_MIMEREPOS|
This is quite handy for doing a mass upload of mime data. Using SE80 you can only upload/download one file per operation (nice job if handling thousands of ressources ;-).
2.2) Using WebDAV Client
Another option is to use a WebDAV client on condition the service is activated on your ABAP system (or you have the rights to enable the needed service) but this will be shown next time.
Christian Ghisler has updated his TotalCommander WebDAV Plugin (since version 2.4) to fullfill the needs to communicate directly with SAP AS ABAP. This is the easiest way to upload/download mimes the windows explorer way.
WebDAV was part of Windows XP and could be used natively from Windows but it is no more running since Windows 7 (dropped by Microsoft).