one assumes you read this as well
Used to use Rsync and Synctoy years ago - but then just went to a NAS with one in another building (like the stuff in
@ilan post linked above). These were set to incremental sync so just changed files were uploaded. It also allows space for all directories etc ..
The problem with "the cloud" here and in similar countries is - bandwidth (expensive), shaky/flaky connectivity, rolling black outs, etc ect.. so, where there is local UPS working (or for me - now solar off grid) it's safer feeling.