I use spideroak. It has been very reliable and fast, but you have to actually want its main feature, which is secure (client encrypted) versioned backup. Keepin

I use spideroak. It has been very reliable and fast, but you have to actually want its main feature, which is secure (client encrypted) versioned backup. Keeping versions saves you from data loss by overwriting but it also needs more storage space. However, spideroak does it in a pretty smart way. I am surprised how little space it actually needs.