I've just symlinked several of my home subdirectories (.vim, .purple, .Skype, mostly append-only catalogs of fine-grained historical data) into Dropbox folder for hassle-free backup, and now watching Dropbox uploading 20,000+ (400 Mb worth) of files, which is well within my space quota.
I'm pretty sure it will succeed, but I've realized that I know nothing of file count limits of Dropbox.
Does any one have any experience with respect to this very parameter?
I will also write to Dropbox support and post their answer here.
UPD. Success. «You added 33697 files» is said at the Events page.
Dropbox doesn't impose a limit on the number of files.