Not all synths are communicating with a computer or have presets.
Manual patch mappers / savers are supporting the documentation and retrieval of your great patches.
For semi modular synths, patch cables can also be documented (patch points on the synth itself but also external ones).
When synths are providing Midi communication by CC, NRPN and/or sysex, full editors (with or without librarian) are providing a nice way to visualize the settings of the patches but also their handling in a bidirectional way.
A librarian functionality is extending the management of the patches by allowing you to combine patches as you want into banks.