File backup not starting

[savingfiles]

On paper R-Drive looks like a good option. Here are my first experiences:
* I created a small file level image backup (2GB or so) destination to Google Drive. It worked.
* I created a new backup job closer to an actual set of backuped files (still file-level backup). Destination is Google drive. The total size of backup file was ~15GB. After 6 hours, the progress was 62%. My broadband is 1Gb so it should be more than enough. I terminated the backup. Way too slow.
* I created another backup job of files (40GB). Progress remained 0% for 4 hours. I gave up. This also had Google drive as destination.

I bought a USB drive and connected the drive directly to the PC under backup.
* The file level backup of 40GB, 0% progress after 2 hours. I gave up.
* I created disk level backup (300GB) destination to the local disk. This works. Backup took maybe 30 mins. This is normal and works.

Initially I bought 2TB of Google drive space to have backups there, but there is a limit: due to a local cache, the size of file you can store to google is as big as the cache file size on local computer. This is something I can't blame R-disk, but my plan A is not possible. I would like to have a backup software that is capable of backing up my files to cloud without such a limitation.
But still... having file level backup working is my target. Cloud preferred, but if not possible, then to a local disk at least. Maybe I could run differential disk backups instead..

sw