Google Drive is notorious for extremely slow upload speed or files not uploading at all. Luckily, there are solutions for this.
If you are planning to back up files to Dropbox from the terminal, Dropbox Uploader is the best solution for you.
One of the easiest way to check if a file is malicious is to upload it to VirusTotal and get it to analyse your file. To make it even easier, you can use the Phrozensoft VirusTotal Uploader to scan files for viruses directly from your desktop, without having to go through the process of opening the browser, loading the VirusTotal website and upload the file.