I'm running OpenSUSE leap 15.5, When I was on the linux mint, I was using warpinator but using it on openSUSE is troublesome and I wish there was a linux version of blip but unfortunately there is not.
I guess i depends on how much data you need to move and how long you want the sync open for. I've had a dropbox account for... I forget how long, and have never paid them a dime.
So you have no data? You don't use it for backups, or storing videos/photos? Seems like you're paying for the same service I get, you're just paying someone else, and likely more.
I use S3 and a sync util to do the same with all my music, photos and videos. I'll be hosting my own S3 soon enough, but for now AWS/Glacier instant retrieval is like 1/10 the cost of Dropbox