Question for the computer savvy among us:

For years I have used Sync Toy to back up my photos to an external hard drive. I just run it once a week in "echo" mode to keep everything on the external drive up to date.

Lately it has become very flaky – last time I ran it it wanted to delete a few hundred photos which I had not altered or even looked at for quite a while. I re set the pair and tried again but it still did not update all the files. An online enquiry revealed that it seems to be incompatible with Windows 10.

I tried a free alternative called AOMEI Backupper but this was so slow it is useless.

Does anyone know a (preferably free) replacement for Sync Toy?