[horde] storage backends suggestions

[Michael Cramer]

Hello,

i have seen in horde 5.1 beta that now two more backends can be  
configured like redis and mongo. are there any suggestions in wich  
usecase which backend is the prefered one. or is there some sort of  
comparison somewhere. i know that not every backend is the right  
solution for each use case. be bo more concret is mongo now the  
preferred one for caching/history/... or still memcache or apc? what  
about redis and a sql based storage?