Hi Gulshan,
Thank you for taking the time to write a review here ??
WP Time Capsule doesn’t compress your files and upload it to your cloud (Google Drive, Dropbox, Amazon S3) like traditional backups. The files are directly uploaded as they are on your site. Hence it takes a while for the first backup to complete depending on the number of files and the size of your website. It doesn’t overload your server while doing that either. Only the primary backup takes long, the next set of backups would be much faster.
I went ahead and checked our backend. I can see that your first backup is still not completed. So could you please wait for the first backup to complete and I am sure that your next incremental backups will not take much time to complete.