I always hope the Pied Piper guy will come and I will be able to fit it all in one hand. One day, one day..

To answer you - don't be a martyr of your data. Find a balance. I chose to save everything, but compress the hell out of it. I.e. I save all photos from my phone, but compress them to 1080p and <= 1MB Jpeg. Because I don't need the tiny details from photos, I just want to keep memories.

The only reason I have FTP at home in an old printer that only supports it for wireless scan uploads. Rsync with SSH is the best, learn what -a, --delete and --checksum arguments do - they are very powerful. To strictly answer the question - SFTP.