does synchronisation, (and backups with lots of options), is cheap $25 and is generously licensed for use on up to 5 computers for home use. Thier support is also quick and helpful.
There is also a freeware version though I'm not sure it does synchronising.
With all these things test it well in realistic scenarios before you let it loose on your real images, there are lots of options in these products.
I'm a user of this product and not affiliated.