How do I efficiently sync a large set of files?

[elbone]

I would like to use FreeFileSync as a daily backup. There are about 250,000 files and each day about 75 new files. A new folder gets created every month for example D:\Dicom\201505. Do you recommend letting it compare the whole thing every day? Currently I just sync the most recent month but I will not be around to change the script every month.

[Zenju]

Best use some macro in the folder path then, e.g. %year%, %month%, %day%, see help file chapter "Macros" for details.